流れ分析法による土壌中の全シアン及びチオシアン酸イオンの同時定量 (特集実用化・産業化を支える分析化学の新潮流 : 生命,環境及び物質科学の基礎・基盤)

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This paper describes the determination of total cyanide and thiocyanate in soil by flow analysis, which uses the cupper chloride-tin chloride reducing distillation (NSOF) method. The apparatus of flow analysis consists of an ultrasonic extraction process of cyanide compounds in soil using a NaOH solution, and an analytical process of total cyanide and thiocyanate ions in the extracted solution. As results to a study of the extraction conditions, when 1.0 g of a soil sample and 50 mL of a 0.05 mol L−1 NaOH solution were used and ultrasonic extraction was performed for 80 s, more than 86% of the total cyanide was recovered. Distillation reagents were used as described concerning the NSOF method, and distillated at 145°C continuously. Total cyanide was determined by 4-pyridinecarboxylicacid-pyrazolone spectrometry and thiocyanate ion was determined by ferric thiocyanate spectrometry. In the case of JIS K 0170 methods, thiocyanate is not contained in total cyanide. The total cyanide content in soil was calculated by subtracting the thiocyanate ion content from the observed total cyanide content. The proposed method can be used to determine total cyanide and thiocyanate ions in soil, simultaneously.
社団法人　日本分析化学会の論文