Speciation of arsenic in water, sediment, and plants of the Moira watershed, Canada, using HPLC coupled to high resolution ICP-MS

被引:80
作者
Zheng, J [1 ]
Hintelmann, H [1 ]
Dimock, B [1 ]
Dzurko, MS [1 ]
机构
[1] Trent Univ, Dept Chem, Peterborough, ON K9J 7B8, Canada
关键词
arsenic speciation; water; sediment; plants; HPLC-ICP-SFMS;
D O I
10.1007/s00216-003-1920-3
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
High-performance liquid chromatography (HPLC) coupled with high-resolution sector field ICP-MS was applied to the speciation of arsenic in environmental samples collected from the Moira watershed, Ontario, Canada. Arsenic contamination in Moira River and Moira Lake from historic gold mine operations is of increasing environmental concern to the local community. In this study, the current arsenic contamination status in water, sediment, and plants was investigated. Elevated levels of arsenic in the surface water of up to 75 ng mL(-1) in Moira River and 50 ng mL(-1) in Moira Lake were detected, 98% of which was present as arsenate. High concentrations of arsenic (>300 ng mL(-1)), mainly present as arsenite, were detected in sediment porewaters. A sediment profile of As from the West basin of Moira Lake showed lower As concentrations compared with data from the 1990s. An optimized extraction procedure using a phosphoric acid-ascorbic acid mixture demonstrated that an unknown 'As-complex' which may consist of As, sulfide and organic matter is potentially responsible for the release of arsenite from the sediment to the overlying water column. Arsenic concentrations in plant samples ranged from 2.6 to 117 mg kg(-1), dry weight. Accumulation of arsenic was observed in submerged plants collected from Moira River and Moira Lake. Only a small part of the arsenic (6.3-16.1%) in the plants was extractable with methanol-water (9:1), and most of this arsenic (70-93%) was inorganic arsenic. A variety of organic arsenic compounds, including simple methylated compounds (methylarsonic acid and dimethylarsinic acid), trimethylarsine oxide, and tetramethylarsonium cation were detected at trace levels. No arsenobetaine and arsenocholine was found in any plant sample. An unknown compound, most probably an arsenosugar was detected in the two submerged plants, coontail ( Ceratophyllum demersum) and long-stemmed waterwort ( Elatine triandra). These submerged plants are constantly exposed to high arsenic concentrations in the surrounding water. Apparently, they are able to grow in this environment without invoking the same biochemical defence known from marine algae to detoxify inorganic arsenic. The detoxification mechanism of these plants remains unknown.
引用
收藏
页码:14 / 24
页数:11
相关论文
共 42 条
[1]   IMPACT OF ABANDONED MINE TAILINGS ON THE ARSENIC CONCENTRATIONS IN MOIRA LAKE, ONTARIO [J].
AZCUE, JM ;
NRIAGU, JO .
JOURNAL OF GEOCHEMICAL EXPLORATION, 1995, 52 (1-2) :81-89
[2]  
AZCUE JM, 1992, THESIIS U WATERLOO C
[3]  
BOWEN HJM, 1979, ENV CHEM ELEMENTS, P92
[4]   ARSENOBETAINE AND OTHER ARSENIC SPECIES IN MUSHROOMS [J].
BYRNE, AR ;
SLEJKOVEC, Z ;
STIJVE, T ;
FAY, L ;
GOSSLER, W ;
GAILER, J ;
IRGOLIC, KJ .
APPLIED ORGANOMETALLIC CHEMISTRY, 1995, 9 (04) :305-313
[5]   ARSENIC ACCUMULATION IN THE MUSHROOM LACCARIA AMETHYSTINA [J].
BYRNE, AR ;
TUSEKZNIDARIC, M .
CHEMOSPHERE, 1983, 12 (7-8) :1113-1117
[6]   ARSENIC SPECIATION IN THE ENVIRONMENT [J].
CULLEN, WR ;
REIMER, KJ .
CHEMICAL REVIEWS, 1989, 89 (04) :713-764
[7]   APPLICATION OF A MASS-BALANCE MODEL TO ASSESS IN-PLACE ARSENIC POLLUTION [J].
DIAMOND, ML .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1995, 29 (01) :29-42
[8]   TRANSFORMATIONS OF ARSENIC IN THE MARINE-ENVIRONMENT [J].
EDMONDS, JS ;
FRANCESCONI, KA .
EXPERIENTIA, 1987, 43 (05) :553-557
[9]   Arsenic species in an arsenic hyperaccumulating fern, Pityrogramma calomelanos:: a potential phytoremediator of arsenic-contaminated soils [J].
Francesconi, K ;
Visoottiviseth, P ;
Sridokchan, W ;
Goessler, W .
SCIENCE OF THE TOTAL ENVIRONMENT, 2002, 284 (1-3) :27-35
[10]   A novel arsenical in clam kidney identified by liquid chromatography/electrospray ionisation mass spectrometry [J].
Francesconi, KA ;
Edmonds, JS .
RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 2001, 15 (17) :1641-1646