Simultaneous determination of zinc and chromate in cooling water by differential pulse polarography

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00279a091· OSTI ID:6171756

Jindal, V K; Kham, M A; Bhatnagar, R M; Varma, S

The use of differential pulse polarography (DPP) for the simultaneous determination of zinc and chromate in cooling water is reported where zinc (5 ppm), chromate (20 ppm), and polyphosphate (50 ppm) formulation is used as a corrosion inhibitor. This will help in effective control of cooling tower performance. The DPP method has been applied for the simultaneous determination of zinc and chromate ions in process and cooling water samples from fertilizer plants in India. The method is based on the reduction of Cr and Zn on SMDE in 1 M NH3-0.1 M NH/sub 4/Cl and 0.005% gelatine supporting electrolyte. Due to interference it is essential to complex calcium ions by adding polyphosphate and to destroy NO/sub 2//sup -//NO/sub 3//sup -/ by adding sulfamic acid along with hydrochloric acid before the actual recording of DP polarograms. The present DP polarographic method for the simultaneous determination of zinc and chromate is comparable in its utility and applicability with spectrophotometric methods. The method has a better accuracy and higher sensitivity and is quick, as both of the ions can be determined in a single scan. 10 references, 4 figures, 5 tables.

• Research Organization: Projects and Development India Ltd., Sindri
• OSTI ID: 6171756
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 57:1; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ASIA
CHEMICAL ANALYSIS
CHROMATES
CHROMIUM COMPOUNDS
COOLING SYSTEMS
CORROSION INHIBITORS
DEVELOPING COUNTRIES
ELEMENTS
ENERGY SYSTEMS
FERTILIZERS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INDIA
INORGANIC ACIDS
MEASURING METHODS
METALS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLAROGRAPHY
PRODUCTION
QUANTITATIVE CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
ZINC