標準號：BS ISO 7766-2003
中文標準名稱：攝影沖洗廢液.氰化物分析.用光譜法測定六氰基高鐵酸鹽(Ⅱ)和六氰基高鐵酸鹽(Ⅲ)
英文標準名稱：Processing photographic wastes - Analysis of cyanides - Determination of hexacyanoferrate(II) and hexacyanoferrate(III) by spectrometry
標準類型：G84
發布日期：2003/6/30 12:00:00
實施日期：2003/6/30 12:00:00
中國標準分類號：G84
國際標準分類號：13.030.30;37.040.30
適用范圍：This International Standard establishes a test method for the determination of hexacyanoferrate (II) (ferrocyanide) and hexacyanoferrate (III) (ferricyanide), referred to hereafter as Fe (CN)6, in photographic processing effluents. Results are reported as hexacyanoferrate, Fe (CN)6. note: 1) Significant levels of thiosulfate (hypo) can result in interference. Significant levels of thiosulfate in processing-machine effluents result in oxidation of the thiosulfate by iron (III). Sulfur will form, increasing the spectrophotometric absorbance which is measured. Also, thiosulfate may deplete the added iron (III) leaving nothing for the colour reaction. The method is applicable to effluents from buildings where the thiosulfate would be diluted by the rest of the building wastes and this would eliminate the interference.