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Updated: Aug 8, 2026

Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
Published on: March 20, 2019
Interference of thiosulfate during colorimetric analysis of hexavalent chromium using 1,5-diphenylcarbazide method
Nirmala Bardiya1, Yong-Woo Hwang, Jae-Ho Bae
1Department of Environmental Engineering, Inha University, 253 Yonghyun-Dong, Nam-Gu, Inchon 402-751, South Korea.
Abstract:
Thiosulfate (S(2)O(3)(2-)) contained in the media for autotrophic Cr (VI) reduction was found to interfere with Cr (VI) measurement following the 1,5-diphenylcarbazide (DPC) method. The interference was confirmed at several abiotic and biotic conditions, and was influenced by S(2)O(3)(2-) concentration, pH, and the media components. At neutral to alkaline pH, 500 mg/L of S(2)O(3)(2-) did not cause interference, while 4 mg/L of S(2)O(3)(2-) resulted in the interference at pH 2.0. Atomic absorption spectrophotometry could be an alternative method when the interference by S(2)O(3)(2-) is expected.
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