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- W1973431903 abstract "Abstract A simplified and improved chemical oxygen demand (COD) procedure is suitable for water and waste water samples containing up to 1500 mg Cl l−1. Samples are digested with sulfuric acid, potassium dichromate, silver sulfate, mercury(II) sulfate and sulfamic acid in open glass tubes for 2 h at 140 ± 2°C without boiling, and excess dichromate is determined colorimetrically at 440 nm. The use of 49-position digestion racks, a large oven and a spectrophotometer fitted with a 1-cm flow cell allow analysis of ca. 12 samples h−1. A correction for chloride interference is not required in the 0–500 mg Cl l−1 range. The detection limit is 3 mg l−1, and the relative standard deviation at the 112 mg COD l−1 level is 4.3%. Thirty-five waste water samples were analyzed by the standard dichromate reflux method and by the proposed procedure. There was no significant difference between the two sets of data (P > 0.25). Recovery data for 15 major water pollutants including benzene, toluene and pyridine are presented." @default.
- W1973431903 created "2016-06-24" @default.
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- W1973431903 date "1976-01-01" @default.
- W1973431903 modified "2023-09-25" @default.
- W1973431903 title "An improved determination of chemical oxygen demand in water and wastes by a simplified acid dichromate digestion" @default.
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- W1973431903 doi "https://doi.org/10.1016/0043-1354(76)90179-2" @default.
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