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投稿时间:2023-10-08 修订日期:2023-12-10
投稿时间:2023-10-08 修订日期:2023-12-10
中文摘要: 本研究旨在解决焦炉煤气脱硫产生的废水中多种离子干扰导致CN-、SCN-难以准确检测问题。为此,本文基于分析化学和消除离子间干扰的基本原理,提出常规无机化学分析方法检测真空碳酸钾法焦化煤气脱硫产生的碱性废液中CN-、SCN-,包括预处理方法和仪器检测步骤。其中,易释放氰化物通过第一次酸化蒸馏,第二次沉淀配合蒸馏的预处理方法实现了SCN-、S2-、SO3 2-和S2O32-对硝酸银容量法对CN-干扰的消除,再利用硝酸银容量法测定CN-浓度。利用沉淀、萃取和配合的预处理方法实现CN-、S2-和苯酚对SCN-检测的干扰消除,在此基础上再利用硫氰酸铁分光光度法测定SCN-。还给出了更明确的检测步骤和影响因素讨论,该方法可用于复杂环境样品中CN-、SCN-的检测,为焦炉荒煤气脱硫过程控制和废水处理提供更好的技术支持。
中文关键词: 氰根、硫氰酸根、检测方法、干扰、荒煤气、脱硫废液
Abstract:The aim of this study is to solve the problem of the difficulty of accurate detection of CN- and SCN- due to the interference of multiple ions in the wastewater produced by coke oven gas desulfurization. To this end, based on the basic principles of analytical chemistry and elimination of inter-ionic interferences, this paper proposes a conventional inorganic chemical analytical method for the detection of CN-, SCN- in the alkaline wastewater generated from coking gas desulfurization by vacuum potassium carbonate method, including a pretreatment method and an instrumental detection step. Among them, the elimination of SCN-, S2-, SO32- and S2O32- from the interference of silver nitrate volumetric method on CN- was realized by the pretreatment method of the first acidification and distillation, and the second precipitation with distillation, and then the concentration of CN- was determined by silver nitrate volumetric method. The elimination of the interference of CN-, S2- and phenol on SCN- detection by precipitation, extraction and coordinated pretreatment methods is realized, on the basis of which SCN- is then determined spectrophotometrically using ferric thiocyanate. More explicit detection steps and discussion of influencing factors are also given, and the method can be used for the detection of CN- and SCN- in complex environmental samples, providing better technical support for the control of coke oven barren gas desulfurization process and wastewater treatment.
文章编号: 中图分类号:X132 文献标志码:
基金项目:无
引用文本:
刘钲楠,付本全,胡辉,曾为一,王丽娜,黄浩.焦炉煤气脱硫废液中CN-、SCN-的测定[J].中国无机分析化学,2024,14(10):1369-1377.
zhengnan,FU Bengquan,HU Hui,ZENG Weiyi,WANG Lina,HUANG Hao.Determination of CN- and SCN- in coke oven gas desulfurization waste liquid[J].Chinese Journal of Inorganic Analytical Chemistry,2024,14(10):1369-1377.
刘钲楠,付本全,胡辉,曾为一,王丽娜,黄浩.焦炉煤气脱硫废液中CN-、SCN-的测定[J].中国无机分析化学,2024,14(10):1369-1377.
zhengnan,FU Bengquan,HU Hui,ZENG Weiyi,WANG Lina,HUANG Hao.Determination of CN- and SCN- in coke oven gas desulfurization waste liquid[J].Chinese Journal of Inorganic Analytical Chemistry,2024,14(10):1369-1377.