Investigations on the use of anodic stripping voltammetry for the analyses of lead in saline environments

Technical Report · Tue Aug 01 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/6550120· OSTI ID:6550120

Case, C W

Research is reported directed to modification of the anodic stripping voltammetry (ASV) analytic method in order to acquire data for lead from ambient sea water conditions, and development of a chemical model which uses these data to identify inorganic lead species for saline environments. Laboratory and field samples were analyzed for lead partitioning in: (a) KCl electrolyte solutions; (b) I.A.P.S.O. Standard Sea Water; (c) seawater samples from Quatsino Sound, British Columbia; (d) a series of seawater samples from San Francisco Bay; and (e) seawater samples from the Gulf of Mexico. The electrochemical traits of the lead species and the ASV oxidation potential expression are the fundamental constituents of the chemical model. The model uses the data from the analyses to provide the mass balance relationships for lead partitioned among the major anions in seawater. The laboratory analyses of KCl electrolyte and Standard Seawater give the following results. The modified ASV method and chemical model provide information on ambient labile and non-labile inorganic lead complexes in these saline solutions down to the parts-per-billion level. No purge and the simple electrodes cause some erratic behavior and spurious potentials, but the data are reproducible. In addition to Pb/sup 2 +/, the most dominant measured lead species in order include PbCO/sub 3//sup 0/, PbSO/sub 4//sup 0/, PbCl/sup +/, and Pb(NO/sub 3/)/sub 2//sup 0/ from the lead additions solution. The analyses of the field samples give the following results. Samples were taken from the partially anoxic basin in Quatsino Sound, British Columbia with one successful analysis which is for somewhat normal dissolved oxygen conditions. Data show that lead is partitioned among Pb/sup 2 +/, Pb(OH)/sub 2//sup 0/, PbCO/sub 3//sup 0/, and PbSO/sub 4//sup 0/. The analyses with purge for the San Francisco Bay water partitions lead among Pb/sup 2 +/, PbCO/sub 3//sup 0/, PbSO/sub 4//sup 0/, PbCl/sup +/, and PbOH/sup +/. With successive lead additions Pb(NO/sub 3/)/sub 2//sup 0/ is decidedly the dominant species.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6550120
• Report Number(s): LBL-7895
• Resource Relation: Other Information: Thesis
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
LEAD
VOLTAMETRY
SEAWATER
CHEMICAL ANALYSIS
ANODES
AQUEOUS SOLUTIONS
BIBLIOGRAPHIES
BRITISH COLUMBIA
GULF OF MEXICO
PACIFIC OCEAN
POTASSIUM CHLORIDES
SAMPLING
SAN FRANCISCO BAY
ALKALI METAL COMPOUNDS
ATLANTIC OCEAN
CANADA
CARIBBEAN SEA
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
DOCUMENT TYPES
ELECTRODES
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
METALS
MIXTURES
NORTH AMERICA
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
SEAS
SOLUTIONS
SURFACE WATERS
WATER
400102* - Chemical & Spectral Procedures
520000 - Environment
Aquatic- (-1989)