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- Title
ADSORPTIVE BEHAVIOUR OF ARSENIC IN A KARST SUBTERRANEAN STREAM AND PRINCIPAL COMPONENTS ANALYSIS OF ITS INFLUENCING VARIABLES: A CASE STUDY AT THE LIHU SUBTERRANEAN STREAM, GUANGXI PROVINCE, CHINA.
- Authors
HUI, Yang; LIANKAI, Zhang
- Abstract
Arsenic (As) pollutants are serious threat to water ecological security and human health, especially in karst areas because of their unique hydrogeological characteristics. Physical-chemical analyses of karst water and its sediments at the Lihu subterranean stream, southwest China, were conducted by ICP-MS and XRF to elucidate the reaction mechanisms of arsenic in karst subterranean streams. The results show that inorganic arsenic comprise most of the total arsenic, while organic arsenic including monomethylated arsenic (MMA) and dimethyl arsenic (DMA) are not detected or infinitesimal. The reducing environment in the subterranean stream makes As(III) dominant and accounts for 53% of the inorganic species. Adsorptive behaviour of arsenic occurred and the removal rates of As, As(III) and As(V) in the Lihu subterranean stream are 51%, 36% and 59% respectively after a 25.6 km underground distance. To find out the main influencing factors on arsenic adsorptive process in this underground river, principal component analysis in SPSS and Minitab were applied. Seven main factors, i.e. sediment Fe (Fesed), sediment Al (Alsed), sediment Ca (Cased), particulate organic matter (POM), sediment Mn (Mnsed), water Ca2+ (Ca2+) and water HCO3 - (HCO3 -) are extracted from thirteen indicators. The rank of those factors for total arsenic and As(III) is Cased > Fesed > Ca2+ > POM > Mnsed > Alsed > HCO3 -, while it is Fesed > Cased > Ca2+ > Mnsed > POM > Alsed > HCO3 - for As(V). Of these seven factors, Fesed, Alsed, Cased, POM, Mnsed and Ca2+ are promoting factors for arsenic adsorption while HCO3 - is an inhibiting factor. Calcium and bicarbonate turn out to be the main influencing factors for water arsenic adsorption in the study area, largely because the high calcium and alkaline values in karst water. This finding is an obvious distinction compared with the research findings at a non-karst area. Arzen (As) je nevaren onesnaževalec, ki ogroža ekološko stanje voda in zdravje ljudi; še posebej v krasu zaradi njegovih edinstvenih hidrogeoloških značilnosti. Z namenom pojasnitve reakcijskih mehanizmov arzena v kraških podzemnih tokovih so bile z uporabo ICP-MS in XRF opravljene fizikalno-kemijske analize kraške vode in sedimentov v podzemnem toku Lihu na jugozahodu Kitajske. Rezultati kažejo, da večino skupnega arzena predstavlja anorganski arzen, organski arzen, vključno z monometil arzenovo kislino (MMA) in dimetil arzenovo kislino (DMA), pa ni bil zaznan. Zaradi redukcijskega okolja v podzemnem toku prevladuje As(III), ki predstavlja 53% anorganskega tipa. Pojavilo se je adsorpcijsko obnašanje arzena in deleži As, As(III) in As(V) so se zmanjšali za 51%, 36% in 59% na 25,6 km dolgem podzemnem toku Lihu. Z namenom določitve najpomembnejših faktorjev, ki vplivajo na procese adsorpcije arzena v tej podzemni reki, je bila uporabljena anliza glavnih komponent v SPSS in Minitab. Sedem glavnih faktorjev, to so Fe v sedimentu (Fesed), Al v sedimente (Alsed), Ca v sedimentu (Cased), suspendirana organska snov (POM), Mn v sedimentu (Mnsed), Ca2+ v vodi (Ca2+) in HCO3 - v vodi (HCO3 -), je bilo povzeto iz trinajstih indikatorjev. Zaporedje teh faktorjev za skupni arzen in As(III) je Cased > Fesed > Ca2+ > POM > Mnsed > Alsed > HCO3 -, za AS(V) pa Fesed > Cased > Ca2+ > Mnsed > POM > Alsed > HCO3 -. Od teh sedmih faktorjev Fesed, Alsed, Cased, POM, Mnsed in Ca2+ spodbujajo adsorpcijo, HCO3 - pa jo zavira. V vodah proučevanega območja sta kalcij in hidrogenkarbonat glavna faktorja, ki vplivata na adsorpcijo arzena, predvsem zaradi visoke vsebnosti kalcija in alkalnosti v kraških vodah. Ta ugotovitev je značilna razlika v primerjavi z raziskovalnimi rezultati za nekraško območje.
- Subjects
GUANGXI Zhuangzu Zizhiqu (China); KARST research; ARSENIC content in groundwater; PRINCIPAL components analysis; HYDROGEOLOGY; GEOCHEMISTRY
- Publication
Acta Carsologica, 2014, Vol 43, Issue 2/3, p287
- ISSN
0583-6050
- Publication type
Case Study