Ion chromatographic determination of total metals in soils

Journal Article · · Soil Science Society of America Journal; (United States)

DOI:https://doi.org/10.2136/sssaj1990.03615995005400050015x· OSTI ID:5453975

Basta, N T; Tabatabai, M A ^[1]

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1. Iowa State Univ., Ames (USA)

An accurate and precise ion chromatographic (IC) method for determination of total Cu, Ni, and Zn in soils was developed. The sample preparation method consists of three steps: (1) digestion of the soil sample by using HNO{sub 3}, HClO{sub 4}, and HF; (2) extraction of the metals of interest by using dithizone in CHCl{sub 3}; and (3) destruction of the metal-dithizonate complex with HNO{sub 3}. The system consisted of a guard (HPIC-CG5) column and a separator (HPIC-CS5) column followed by postcolumn reaction with 4-(2-pyridylazo) resorcinol (PAR), to form colored metal complexes. The absorbance of the metal-PAR complexes was measured by an ultraviolet-visble light (UV-VIS) detector at 520 nm. Two different eluents were required for separation of these and other metals. Simultaneous determination of Cd, Cu, Mn, and Zn was achieved by using an eluent containing 4 mM 2,6-pyridinedicarboxylic acid (PDCA) and 50 mM HOAc-NaOAc buffer (pH 4.8). Simultaneous determination of Cu, Ni, Pb, and Zn was accomplished by using an eluent containing 40 mM oxalic acid and 50 mM HOAc-LiOAc buffer (pH 4.8). Results by the IC method for determination of total Cu, Ni, and Zn in 14 soils were in good agreement with those obtained by atomic absorption spectrophotometry, but results also showed that the proposed IC method is inadquate for determination of total Cd, Mn, and Pb in soils.

• OSTI ID: 5453975
• Journal Information: Soil Science Society of America Journal; (United States), Vol. 54:5; ISSN 0361-5995
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CADMIUM
ION EXCHANGE CHROMATOGRAPHY
COPPER
LEAD
MANGANESE
NICKEL
SOILS
CONTAMINATION
ZINC
ECOLOGICAL CONCENTRATION
LAND POLLUTION
SOLVENT EXTRACTION
CHROMATOGRAPHY
ELEMENTS
EXTRACTION
METALS
POLLUTION
SEPARATION PROCESSES
TRANSITION ELEMENTS
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)