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In-situ analytical study of bricks exposed to marine environment using hand-held X-ray fluorescence spectrometry and related laboratory techniques

Author: Morillas Loroño, Héctor,García Florentino, Cristina,Marcaida Ormazabal, Iker,Arana Momoitio, Gorka,Madariaga Mota, Juan Manuel
Publisher: Elsevier
Year: 2018
DOI: 10.1016/j.sab.2018.04.02
Source: https://addi.ehu.eus/bitstream/10810/65284/4/In-situ%20analytical%20study%20of%20bricks-publicable.pdf
1
In-si u analy ical s udy o b icks exposed o 1
ma ine en i onmen using Hand-Held X- ay 2
luo escence spec ome y and ela ed 3
labo a o y echniques 4
5 Héc o Mo illasa*, C is ina Ga cía-Flo en inoa, Ike Ma caidaa, 6 Mai e Magu eguib, Go ka A anaa, Luis F.O. Sil ac and Juan Manuel Mada iagaa
7
8 aDepa men o Analy ical Chemis y, Facul y o Science and Technology, Uni e si y o he Basque 9 Coun y UPV/EHU, P.O. Box 644, 48080 Bilbao, Basque Coun y, Spain 10 e-mail: hec o [email p o ec ed]s11 bDepa men o Analy ical Chemis y, Facul y o Pha macy, Uni e si y o he Basque Coun y UPV/EHU,12 P.O. Box 450, 01080 Vi o ia-Gas eiz, Basque Coun y, Spain13 cResea ch G oup in En i onmen al Managemen and Sus ainabili y, Facul y o En i onmen al Sciences,14 Uni e sidad De La Cos a, Calle 58 #55-66, 080002 Ba anquilla, A lán ico, Colombia15
16 ABSTRACT 17
18 In his wo k, he deg ada ion p ocesses ha ake place in b icks exposed o ma ine 19
en i onmen s ha e been s udied. Taking in o accoun he impo ance o his building 20
ma e ial whe e he silica es p esen in he inal p oduc ac as s abilize in he po ous 21
ma e ial i sel , i is necessa y o unde s and he decay p ocesses ha occu in hese 22
agg essi e en i onmen s. As is known, he ma ine ae osol ca ies di e en ypes o sal s, 23
such as chlo ides, sul a es, ni a es, e c., p esen in su ounding en i onmen exe ing a 24
nega i e in luence on he ma e ials p oducing c acking and disin eg a ion p ocesses o 25
he ma e ial and consequen ly loss o b ick wall s abili y. Nowadays he de elopmen o 26
po able de ices is aking much mo e impo ance helping esea che s o esol e p oblems 27
in he ield in a as and easy way. In o de o ex ac as and sa is ac o y esul s abou 28
he conse a ion s a e o di e en b icks om Pun a Begoña Galle ies (Ge xo, Basque 29
Coun y, Spain), an in-si u analy ical me hodology was de eloped based on he use o 30
hand-held Ene gy Dispe si e X- ay luo escence spec ome y (HH-ED-XRF) assis ed 31
wi h o he labo a o y echniques (µ-ED-XRF and X-Ray Di ac ion) in o de o 32
co obo a e and complemen he in o ma ion ob ained in-si u. This cons uc ion 33
unde goes he in luence o ma ine ae osol, indus ial po , powe gene a ion plan s, and 34
a uel e ine y among o he s. The pa hologies isually obse able in hese b icks a e 35
disin eg a ion, b eakup and de achmen o he b icks. The p esence o de e io a ion 36
compounds in he b icks has been s udied acco ding o he o ien a ions o he b icks inside 37
he cons uc ion. 38
This is he accep ed manusc ip o he a icle ha appea ed in inal o m in Spec ochimica Ac a Pa B: A omic Spec oscopy 146 : 28-35
(2018), which has been published in inal o m a h ps://doi.o g/10.1016/j.sab.2018.04.020. © 2018 Else ie unde CC BY-NC-ND license
(h p://c ea i ecommons.o g/licenses/by-nc-nd/4.0/)
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Keywo ds: B ick; in-si u analysis; ma ine en i onmen ; HH-ED-XRF, calcium
40
silica e.
41
42
43
1. In oduc ion
44
Since ancien imes, b icks a e some o he mos used ma e ials in cons uc ions. In
45
5,000 BC, he b ick appea ed as building ma e ial, and a ound 3,500 BC, he i ed b ick
46
was inally c ea ed. Thanks o he indus ializa ion in he 19 h cen u y, he use o b ick as
47
building ma e ial inc eased and acqui ed g ea impo ance, being one o he mos used
48
ma e ial o he building cons uc ions [1].
49
B icks used o cons uc ions a e made om clay, which is kneaded wi h 20-25% wa e .
50
The esul ing pas e is molded and he b icks ob ained a e d ied in he ai [2]. Al hough
51
se e al p ocesses o b icks p oduc ion exis , a ious mix u es o aw clays (mainly
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composed o illi e-chlo i e, qua z, calci e and/o dolomi e, sodium and po assium
53
eldspa s, and i on oxides/hyd oxides) a e i ed a abou 900–1025°C in o de o ob ain
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he inal b ick [3]. Thei cha ac e is ic eddish-o ange colou , is indica i e o he amoun
55
and ype o i on oxides and oxyhid oxides p esen in he clay used o i s manu ac u e
56
[4]. Howe e , o he chemical elemen s such as Sb, Pb, Ca, Fe and aces o Cu ha e a key
57
ole in he eddish o ange colou o he b icks [5]. In his sense, he composi ion and
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mic os uc u e o he b icks a e some o he mos impo an cha ac e is ics o p ese e
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hei du abili y [6, 7]. Mo eo e , he clay mus ha e a low amoun o impu i ies and
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especially mus ha e a low con en o calcium ca bona e o be plas ic enough, and o
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a oid he p esence o un eac ed lime a e i ing. The p esence o calcium ca bona e in
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he b icks can cause c acks when he clay is mixed wi h wa e . Fo his eason, usually
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he clay mus con ain calcium ca bona e in a p opo ion o less han 8-10%. Du ing i ing,
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a se ies o mine alogical ans o ma ions ake place depending essen ially on he ini ial
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composi ion, kiln empe a u e, hea ing g ade, i ing ime and p e alence o oxidizing o
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educing eac ions [8-10] ede ining he mine alogical composi ion and mic os uc u e.
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In his way, a e i ing a 900-1025°C, kaolin is dissocia ed in o silica and alumina and
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also in o calcium and aluminum silica e. One o he c i ical ac o s in he conse a ion
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s a e o b icks is he con en o calcium silica e ha p o ides s abili y o he s uc u e and
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3
esis ance o empe a u e changes. Consequen ly, he b icks i e o cooking empe a u e
71
is es ablished as one o he mos impo an s eps in he b icks cons uc ion [11, 12].
72
B icks, as all building ma e ials, can expe imen di e en chemical eac ions ha could
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p omo e changes in hei appea ance and conse a ion s a e. B icks can su e he e ec
74
o humidi y [13,14], biocoloniza ions [15], he a ack o a mosphe ic acidic gases [16],
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in il a ions by aqueous solu ions [17-19], he impac o ma ine ae osols [20, 21], d y and
76
we deposi ions [22-24], eeze- haw cycles [25], e c. These sou ces o de e io a ion, can
77
p omo e se e al chemical and physical p oblems as well as e lo escences o ma ion [17],
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loss o ma e ial [26], e c.
79
In he li e a u e, he e a e many wo ks ha analyze b icks in o de o ex ac conclusions
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abou hei conse a ion s a e [27, 28], he p o enance [29], o iginal composi ion [30],
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he b ick composi ion in luence on decay compounds [31], e c. Mo eo e , di e en
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echniques such as X-Ray di ac ion (XRD) [32], Raman spec oscopy [33, 1, 19],
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in a ed spec oscopy [34, 35], Induc i ely Coupled Plasma Mass Spec ome y (ICP-
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MS) [36], Lase abla ion Induc i ely Coupled Plasma Mass spec ome y (LA-ICP-MS)
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combined wi h Ins umen al Neu on Ac i a ion Analysis (INAA) and X- ay
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luo escence (XRF) [37], XRF [38] and Lase -induced b eakdown spec oscopy (LIBS)
87
[39], ha e been used o ca y ou hese ypes o analyses. In all hese case s udies, he
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analy ical ins umen s used we e labo a o y bench op de ices and he e a e no wo ks ha
89
use hand-held/po able ins umen s o analyze b icks and o e alua e hei pa hologies.
90
Some imes he ex ac ion o samples is a c i ical s ep, mainly due o sampling es ic ions.
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Fo his eason, he applica ion o po able de ices is aking much mo e impo ance,
92
helping esea che s o ca y ou di e en in-si u analyses ob aining sa is ac o y esul s
93
wi hou he necessi y o aking samples [40-42, 18]. Example o hese ypes o de ices
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a e he hand-held Ene gy Dispe si e X-Ray luo escence spec ome e s (HH-ED-XRF),
95
o which i s use is being inc eased in he las yea s, because hey a e use iendly and
96
o e esul s in ew seconds o minu es [43-45]. As a consequence o his, many
97
wo ldwide scien i ic g oups a e imp o ing and de eloping new analy ical me hodologies
98
based on hese kind o de ices [46, 47].
99
In his wo k, a simple, as and non-des uc i e me hodology based on he use o a hand-
100
held Ene gy Dispe si e X- ay luo escence spec ome e (HH-ED-XRF) was applied o
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pe o m a ield analysis o b icks om Pun a Begoña Galle ies (Ge xo, Basque Coun y,
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Spain) which show di e en de e io a ion deg ees depending mos ly on hei loca ion in
103
4
on o he indus ial po o Bilbao and di e se ac o ies emi ing a mosphe ic pollu an s.
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In o de o con i m and complemen conclusions ex ac ed in-si u, addi ional analyses
105
we e conduc ed in he labo a o y using mic o-ED-XRF spec ome y and X-Ray
106
di ac ion (XRD) echniques.
107
2. Expe imen al
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2.1. Pun a Begoña Galle ies
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Pun a Begoña Galle ies a e loca ed in Ge xo, close o E eaga beach, in Biscay (Basque
111
Coun y, Spain). These galle ies we e buil in 1918 by an indus ial ycoon, Ho acio
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Eche a ie a [48]. I is one o he mos signi ica i e cons uc ion in Biscay and Basque
113
Coun y o he 20 h cen u y. Nowadays, i is abandoned and i is poo ly p ese ed (see
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Fig. 1). The cons uc ion is composed by wo galle ies: he uppe galle y o “No hwes
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Galle y” (NG) and he lowe galle y o “Sou hwes Galle y” (SG). The NG is o ien ed o
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he no hwes , and he SG is o ien ed o he sou hwes . All he cons uc ion is placed in
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on o he sea; he e is a beach in on o he NG and a leisu e po in on o he SG,
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oge he wi h he indus ial po o Bilbao a 1-8 km and se e al ac o ies ( e ine y, powe
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s a ion plan o liquid hyd oca bons, and me allu gical companies), emi ing acid gases
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and me allic pa icles o he a mosphe e, a no mo e han 10 km om he building. The
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whole building is made by di e en ma e ials such as conc e e, ce amic, mo a , cemen ,
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limes one and b ick.
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2.2. In-si u analyses
124
125
The in-si u analyses we e ca ied ou in bo h galle ies by means o HH-ED-XRF. Fo his
126
pu pose, se en a eas om he No hwes Galle y (coded samples NG1-NG7) and
127
addi ional se en om he Sou hwes Galle y (coded samples SG1-SG7) we e selec ed
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(see Fig. 1). As can be obse ed in Fig. 1, b icks show a be e o wo se conse a ion s a e
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depending on he o ien a ion.
130
2.3. Ins umen a ion
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The in-si u elemen al analysis o he b icks was ca ied ou using an XMET5100 (Ox o d
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Ins umen s, UK) hand-held ene gy dispe si e X-Ray luo escence spec ome e (HH-
133
ED-XRF). The ins umen is equipped wi h an Rh ube wo king a a maximum ol age o
134
45 kV. The spo size o he emi ed X-Ray beam is 9 mm. The analyze includes a Pel ie -
135
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cooled silicon d i de ec o (SDD) o high esolu ion ha is able o p o ide an ene ge ic
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esolu ion o 150 eV (calcula ed o he Mn Kα line). The analyze con ains a PDA o
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con ol he spec ome e and also o sa e he spec a and semi-quan i a i e in o ma ion.
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To de e mine he p esence o he hea ies elemen s (Z>Ti) he ol age and cu en o he
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X-Ray ube was se a 40 kV and 15 µA espec i ely and he spec a we e acqui ed du ing
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100 seconds ( eal ime) in o de o imp o e he limi o de ec ion o he iden i ica ion o
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ace elemen s. Addi ionally, o emo e he B emss ahlung and possible B agg
142
di ac ion peaks, a 500 µm Al il e was used. In o de o imp o e he de ec ion o he
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ligh e elemen s (Z<Ti), addi ional measu emen s we e pe o med wi hou he Al il e
144
and a lowe ol age (13 kV) and highe cu en (40 µA) du ing 70 seconds. In o de o
145
de e mine possible con ibu ions om de ec o ma e ials and possible con amina ions o
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he XRF analyze window, 20 epe i i e spec a o an ins umen al blank (a PTFE block)
147
we e acqui ed be o e each measu emen s ba ch. Fo he epe i i e measu emen s, he
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same spec al condi ions ( ol age, cu en , il e and es ime) as hose used o he
149
analysis o he b icks we e conside ed. Al hough he so wa e is based on he use o
150
Fundamen al Pa ame e s quan i ica ion me hods, in his wo k, he ne coun s o Kα lines
151
o each de ec ed elemen in he spec um we e conside ed ollowing a no maliza ion
152
p ocess. See elsewhe e o u he de ails [43]. To ex ac ep esen a i e esul s, en
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measu emen s (9 mm a ea each one) we e pe o med andomly dis ibu ed on se en a eas
154
om he NG (NG1-NG7) and on addi ional se en om he SG (SG1-SG7). In o de o
155
e alua e he elemen al composi ion o he b icks wi hou ex ac ing any sample, semi-
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quan i a i e in o ma ion gi en by he HH-ED-XRF was a oided. Ins ead o ha , a
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speci ic spec al da a ea men based on he no maliza ion o he ne coun s o each
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de ec ed elemen was conduc ed [43]. Fo all he de ec ed elemen s, ne coun s associa ed
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wi h Kα line we e conside ed, excep o Pb o which Lβ line was used. Conside ing ha
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Fe is a majo elemen which showed an almos cons an concen a ion in all he measu ed
161
a eas, i s Fe Kα line was used o no malize he ne coun s o ligh elemen s (Z≤20) in he
162
spec a. Fo he hea ies elemen s (Z ≥ 26), he ne coun s o hei Kα lines we e
163
no malized agains he ne coun s o he Comp on line (incohe en sca e ing). This
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no maliza ion p ocess was done in o de o co ec possible ma ix e ec s and a ia ions
165
in he posi ioning o he measu ing sampling in e ace. In o de o a oid spec al
166
in e e ences be ween he As K1 and Pb L1 lines, Kβ1 (11.7 keV) and Pb Lβ1 (12.6 keV)
167
lines we e conside ed o As and Pb espec i ely.
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In o de o ex ac mo e conclusions, he elemen al composi ion was also s udied in he
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labo a o y by using he M4 TORNADO Ene gy Dispe si e X- ay Fluo escence
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spec ome e (B uke Nano GmbH, Be lin, Ge many). This ins umen is equipped wi h
171
a mic o- ocus side window Rh X- ay ube powe ed by a low-powe HV gene a o and
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cooled by ai . The spec al acquisi ions in his wo k we e pe o med a he maximum
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ol age (50 kV) and cu en (600 μA) ha he X- ay sou ce allows. This equipmen can
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wo k using polycapilla lenses, which allow pe o ming bo h single poin measu emen s
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down o 25 μm o la e al/spa ial esolu ion, and Hype Maps o de e mine he dis ibu ion
176
o each elemen de ec ed in he collec ed agmen s. A XFlash® silicon d i de ec o wi h
177
30 mm2 sensi i e a ea and ene gy esolu ion o 145 eV o Mn-Kα was used o
178
luo escence adia ion de ec ion. In o de o imp o e he de ec ion o he ligh es elemen s
179
(Z<11), il e s we e no used and measu emen s we e acqui ed unde acuum (20 mba ).
180
The acuum was achie ed wi h a diaph agm pump MV 10 N VARIO-B. The li e ime
181
used o each single poin measu emen was 200 seconds. Two ideo-mic oscopes we e
182
used o ocus he a ea unde s udy, a low magni ica ion (1 cm2 a eas) one o he
183
explo a ion o he sample and a highe magni ica ion one (1 mm2 a eas) o he inal
184
ocusing. In o de o ob ain he Hype Maps, he Kα line o each elemen was used a e a
185
p e ious elemen al assigna ion and decon olu ion o he spec al in o ma ion using he
186
M4 TORNADO so wa e (B uke Nano GmbH, Be lin, Ge many).
187
Finally, XRD analyses we e pe o med wi h a powde di ac ome e PANaly ical X´Pe
188
PRO, equipped wi h a coppe ube (λCuKαmedia= 1.5418 Å, λCuKα1= 1.54060 Å, λCuKα2=
189
1.54439 Å), e ical goniome e (B agg-B en ano geome y), p og ammable di e gence
190
ape u e, au oma ic in e change o samples, seconda y monoch oma o om g aphi e and
191
PixCel de ec o . The measu emen condi ions we e 40 kV and 40 mA, wi h an angula
192
ange (2θ) scanned be ween 5 and 70°. Fo he da a ea men o he di ac og ams and
193
he iden i ica ion o he p esen mine al phases, he speci ic so wa e X`Pe HighSco e
194
(PANaly ical) in combina ion wi h he speci ic powde di ac ion ile da abase
195
(In e na ional Cen e o Di ac ion Da a - ICDD, Pennsyl ania, USA) was used.
196
197
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198
Fig. 1. Pun a Begoña Galle ies (Ge xo, Basque Coun y, no h o Spain) and he analyzed
199
b ick a eas om hei No hwes and Sou hwes Galle ies (NG and SG).
200
201
202
3. Resul s and discussion
203
204
3.1. HH-ED-XRF analyses
205
To simpli y he isualiza ion o he no malized a eas ela ed o he a e age o he 10
206
spec al measu emen s om each s udied a ea, hey a e p esen ed as a ba g aph (see Fig.
207
2). In Table S1 om Appendix, he no malized coun s o all he elemen s de ec ed in he
208
measu ed a eas a e p esen ed as he a e age o he en epe i i e measu emen s on each
209
a ea oge he wi h hei espec i e s anda d de ia ions. Among all he de ec ed elemen s,
210
Cl, B and S can be p esen in he b ick coming om he ma ine ae osol [48-50]. The
211
las elemen could be also na u ally p esen in he b icks. As i has been explained in he
212
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expe imen al sec ion, o a oid alse posi i es he backg ound o e ed by he ins umen
213
(ins umen al blank) was e alua ed. This issue can be conside ed o special in e es
214
conside ing he in e e ence caused by he Rh L coming om he ube in he Cl K line.
215
The no malized coun s o Cl, B and S o all he a eas in he NG and SG a e qui e simila
216
(see Fig. 2A), al hough a li le bi highe alues we e egis e ed in some measu ed a eas
217
om he SG.
218
In all he analyzed a eas, S was also de ec ed. The p esence o his elemen in he b icks
219
could sugges he possible p esence o sul a es. These compounds can be p esen in he
220
b icks due o he in luence o in il a ion wa e s ich in sul a es o as a consequence o
221
he impac o a mosphe ic SOx. Calcium ca bona e ha can be p esen on hem can eac
222
wi h he sul a es in he i s case and wi h he H2SO4 coming om he a mosphe ic SOx.
223
S no malized coun s alues a e highe in he SG han in he NG, excep o he case o
224
NG1 and NG7 a eas.
225
Apa om elemen s ha can be p esen in he b icks due o he in luence o he
226
su ounding a mosphe e, hose ela ed wi h he o iginal composi ion we e also e alua ed.
227
In Fig. 2B, he no malized coun s o hese kind o elemen s (Al, Si, K, Ca and Fe) a e
228
p esen ed. The no malized coun s o Al and Si a e qui e simila excep o he NG7 a ea,
229
whe e a li le bi highe alues we e egis e ed. The p esence o bo h elemen s in he
230
b icks is ela ed wi h he con en o silica es and aluminosilica es on hem. The esul s
231
ob ained o K a e qui e simila , e ealing simila no malized coun s alues in all he
232
a eas, excep in he NG1 a ea, which shows highe alues han he es o he a eas.
233
Acco ding o Ca, he highes alues we e egis e ed in he SG, al hough in he NG high
234
alues we e also ob ained o he NG1 and NG7 a eas, as i happened o Ca. As has been
235
p e iously men ioned, he p esence o Fe is qui e simila in all he measu ed a eas. This
236
elemen is ela ed wi h he p esence o i on oxides and oxy-hyd oxides in he b icks,
237
compounds ha gi e he cha ac e is ic o ange- ed colo o he analyzed b icks.
238
The no malized coun s o Ti, V, C , Mn, Ni, Cu, Zn and Pb a e p esen ed in Fig. 2C. Ti,
239
V, C and Mn show in e e ence once wi h each o he ’s. Thus, hese in e e ences could
240
al e he conclusions ha can be ex ac ed analyzing he no malized coun s. Lea ing aside
241
his obse a ion, he no malized coun s o each elemen is simila in all he analyzed
242
a eas, sugges ing ha he main con ibu ion o hese me als come om he na u al aw
243
ma e ial i sel . This endency was no obse ed o Pb. In his case, highe no malized
244
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coun s we e ob ained in he a eas om NG han in a eas om SG; pa icula ly, his
245
elemen was no iden i ied in he SG2 a ea. This obse a ion could sugges a possible
246
deposi ion o Pb coming om he su ounding a mosphe e, especially in he b icks om
247
he NG a ea. I is necessa y o ema k ha he e a e me allu gical indus ies om he
248
me opoli an Bilbao, no a away om he Galle ies, and hey con ibu e o emissions o
249
me allic pa icles, being possible hei subsequen d y deposi ion [22, 23, 45].
250
Finally, o he es o he de ec ed elemen s (see Fig. 2D) he ob ained alues we e simila
251
in all he measu ed a eas excep o Z and Sn. The no malized coun s o Z a e simila
252
in all he a eas, excep in NG7 a ea, whe e he e is no p esence o his elemen . Finally,
253
i is necessa y o ema k ha Sn was de ec ed in all he NG a eas bu only in ew a eas
254
om he SG was de ec ed (SG5 and SG7)
255
256
257
Fig. 2. Ba cha s ep esen ing he loga i hm o he no malized a eas ela ed o he a e age
258
o he 10 spec al measu emen s ob ained wi h HH-ED-XRF on each measu ed a ea
259
oge he wi h hei e o ba s o A) S, Cl, B and S ; B) Al, Si, K, Ca, Fe; C) Ti, Ni, Cu,
260
Zn, Pb and D) Rb, Y, Z and Sn.
261
3.2. P incipal Componen Analysis (PCA) o in-si u ED-XRF esul s
262
In o de o ex ac addi ional conclusions, he da a ma ix (no malized coun s o NG and
263
SG a eas, 14 a eas x 10 analysis each) was subjec ed o P incipal Componen Analysis
264
16
Acknowledgemen s
429
This wo k has been unded by he Spanish Minis y o Economy, Indus y and
430
Compe i i eness and he Eu opean Regional De elopmen Fund (ERDF/FEDER),
431
h ough he p ojec MADyLIN (G an No. BIA2017-87063-P, AEI-EU/FEDER) and by
432
he coope a ion ag eemen be ween he Uni e si y o he Basque Coun y (UPV/EHU)
433
and he Ci y Council o Ge xo (OTRI2014-0639). Technical suppo p o ided by Gene al
434
X- ay Se ice o he SGIKe (UPV/EHU, Minis y o Economy and Compe i i eness o
435
Spain, Basque Go e nmen , ERDF and Eu opean Social Fund) is also g a e ully
436
acknowledged.
437
438
Appendix A. Supplemen a y da a
439
Supplemen a y da a o his a icle can be ound online a DOI:..
440
441
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617
618
FIGURE CAPTIONS
619
620
Fig.1. Pun a Begoña Galle ies (Ge xo, Basque Coun y, no h o Spain) and he analyzed
621
b ick a eas om hei No hwes and Sou hwes Galle ies.
622
Fig.2. Ba cha s wi h no malized a eas ela ed o he a e age o he 10 spec al
623
measu emen s ob ained wi h HH-ED-XRF and hei e o ba s o A) S, Cl, B and S ; B)
624
Al, Si, K, Ca ,Fe ; C) Ti, Ni, Cu, Zn, Pb and D) Rb, Y, Z and Sn.
625
Fig.3. Co ela ion g aph o he Ca and S no malized coun s and analyzed a eas.
626
Fig.4. μ-ED-XRF imaging o one o he analyzed b ick obse ing he elemen al
627
dis ibu ion o di e en elemen s. (Fo in e p e a ion o he e e ences o colo in his
628
igu e legend, he eade is e e ed o he web e sion o his a icle).
629
630