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4120938 
Journal Article 
Iodometric method for determination of trace chlorate ion 
Ikeda, Y; Tang T-F; Gordon, G 
1984 
Yes 
Analytical Chemistry
ISSN: 0003-2700
EISSN: 1520-6882 
AMER CHEMICAL SOC 
WASHINGTON 
HEEP/84/11630 
56 
1 
71-73 
English 
WOS:A1984SB04300023 
HEEP COPYRIGHT: BIOL ABS. A modified iodometric method was reported to measure chlorate ion concentration at the submilligram/liter level with high precision and accuracy. Hexane and N were used as shielding agents to isolate the sample solution from the air phase to prevent air oxidation of iodide ion. Chlorate ion was reduced by iodide ion in 6 M HCl. By the addition of saturated sodium phosphate, the H+ concentration was lowered to ? 3 M, and the liberated I was titrated with standard sodium thiosulfate solution. The end point was detected by using Thyodene as the indicator or by the color of I in the hexane layer. A potentiometric end point was recommended for the determination of chlorate ion at concentrations and lt; 1.0 this modified iodometric method, the chlorate ion at the submilligram/liter level was determined with a precision of and gt; | 1%.