SOLUBILITY AND MOBILITY OF COPPER, ZINC AND LEAD IN ACIDIC ENVIRONMENTS

被引：109

作者：

REDDY, KJ ^{[1
]}

WANG, L ^{[1
]}

GLOSS, SP ^{[1
]}

机构：

[1] UNIV WYOMING, DEPT PLANT SOIL & INSECT SCI, LARAMIE, WY 82071 USA

来源：

PLANT AND SOIL | 1995年 / 171卷 / 01期

关键词：

AVAILABILITY OF METALS; CHEMICAL SPECIATION; INORGANIC COMPLEXES; ORGANIC COMPLEXES;

D O I：

10.1007/BF00009564

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Understanding the chemical speciation of metals in solution is necessary for evaluating their toxicity and mobility in soils. Soil samples from the Powder River Basin, Wyoming were extracted with distilled deionised H2O. Soil water extracts were subjected to chemical speciation to determine the relative distribution and chemical forms of copper (Cu), zinc (Zn) and lead (Pb) in acidic environments. As pyrite oxidised, the pH decreased from 6.6 to 2.4, concentration of dissolved sulfate (S-T) increased from 259 to 4,388 mg L-(1) and concentration of dissolved organic carbon (DOG) decreased from 56.9 to 14.4 mg L(-1). Dissolved Cu concentrations ranged from 0.06 to 0.42 mg L(-1) and dissolved Zn concentrations ranged from 0.084 to 4.60 mg L(-1). Dissolved concentrations of Pb were found to be 0.003 to 0.046 mg L(-1). Chemical speciation indicated that at near neutral pH, dissolved metal concentration in soil water extracts was dominated by DOC- metal complexes. At low pH, dissolved metal concentration in soil water extracts was dominated by free ionic forms (e.g. Cu2+, Zn2+, Pb2+) followed by ion pairs (e.g. CuSO40, ZnSO40, PbSO40). Results obtained in this study suggest that as soil pH decreased, the availability and mobility of metal ions increased due to the chemical form in which these metal ions are present in soil solutions.

引用

页码：53 / 58

页数：6

共 23 条

[1]

Adriano D. C., 1986, Trace elements in the terrestrial environment.

[2]

Baker D. E., 1982, Methods of soil analysis. Part 2. Chemical and microbiological properties, P13

[3] TITRATION CURVES OF FULVIC ACID - ANALYTICAL CHEMISTRY OF A WEAK ACID POLYELECTROLYTE [J].

GAMBLE, DS .

CANADIAN JOURNAL OF CHEMISTRY, 1970, 48 (17) :2662-&

[4]

Kennedy IR., 1986, ACID SOIL ACID RAIN

[5]

Lindsay W. L., 1979, Chemical equilibria in soils.

[6]

MARTIN L, 1988, US GEOL SURV WATER R, P88

[7]

Mattigod S. V., 1979, ACS Symposium Series, V93, P837

[8] GEOCHEMICAL PROCESSES CONTROLLING SELENIUM IN GROUND-WATER AFTER MINING, POWDER RIVER BASIN, WYOMING, USA [J].

NAFTZ, DL ;

RICE, JA .

APPLIED GEOCHEMISTRY, 1989, 4 (06) :565-575

[9] THE CONTRIBUTION OF HUMIC SUBSTANCES TO THE ACIDITY OF COLORED NATURAL-WATERS [J].

OLIVER, BG ;

THURMAN, EM ;

MALCOLM, RL .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1983, 47 (11) :2031-2035

[10]

REDDY KJ, 1993, APPL GEOCHEM S, V2, P159

← 1 2 3 →