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本文用上海有机化学研究所的以三庚基十二烷基铵与十二烷基苯磺酸形成的离子对化合物,为电极活性材料所制成的液膜型阴离子洗涤剂选择电极(AD电极)。用电位滴定法或多次连续标准加入法,测定了洗衣工场废水及漂染废水中的LAS。检测下限:电位滴定法为1毫克/升LAS,多次连续标准添加法为0.1毫克/升。电位滴定变异系数≤±7％。回收率:91％—109％之间。具有操作简便、慢速、准确,与甲烯蓝紫外分光光度法测得结果基本相符。由于家庭和工业上使用的合成洗涤剂的改型,即由阴离子型支链苯磺酸钠(简称ABS),改成阴离子直链烷基苯磺酸钠(简称LAS)。目前洗涤剂工场及漂染厂排放的废水中主要是阴离子型直链烷基苯硫酸钠(LAS)。随着洗涤剂用量的不断增长,排放水中的阴离子合成洗涤剂,已成为环境污染的一个来源。上海市环保局已制订出LAS的排放标准。目前检测排放水中的LAS普遍采用次甲基蓝比色法,但其操作繁琐,所用氯仿有毒,并在可见光部份由于漂染废水本身的颜色及所含有机物,经UV—260型分光光度计的光谱扫描分析,干扰较大。近年来用阴离子洗涤剂选择性电极为指示电极,电位滴定法测定在洗衣工场废水中阴离子合成洗涤剂的方法有所报道,但用于漂染废水中无专文报道,对多次连续标准添加法也未见报道。我们使用液膜型洗涤剂选择性电极(简称AD电极),作为终点指示电极,而用单液接饱和甘汞电极作参比电极,以电位滴定法及多次连续标准添加法,可测定洗衣工场及漂染废水中的LAS。检测下限为1毫克/升(电位滴定法);0.1毫克/升(多次连续标准添加法),变异系数≤7％,回收率92％—109％,它与甲烯蓝紫外分光光度法测得的结果相符,具有操作简单,分析周期短,没有溶剂污染等优点。
In this paper, the ion-pair compound formed by the heptanyl dodecylammonium and dodecylbenzenesulfonic acid of Shanghai Institute of Organic Chemistry is a liquid film type anionic detergent selection electrode made of electrode active material (AD electrode ). Potentiometric titration or multiple continuous standard addition method was used to determine the LAS in laundry wastewater and bleaching wastewater. Lower limit of detection: potentiometric titration 1 mg / L LAS, multiple continuous standard addition of 0.1 mg / liter. Potential titration coefficient of variation ≤ ± 7%. Recovery rate: between 91% -109%. With simple operation, slow, accurate, and methylene blue spectrophotometry measured results are basically consistent. Due to the domestic and industrial use of synthetic detergent modified, that is, from anionic branched benzene sulfonate (ABS), into an anionic linear alkyl benzene sulfonate (LAS). At present, the wastewater discharged from detergent factories and dyeing factories is mainly anionic linear sodium alkyl benzene sulphate (LAS). With the increasing amount of detergent, the discharge of anionic synthetic detergent in water has become a source of environmental pollution. Shanghai Environmental Protection Agency has set the LAS emission standards. At present, LAS in detection of discharged water generally adopts methionine blue colorimetric method. However, its operation is cumbersome and the chloroform used is poisonous. In the visible part, due to the color of the dyeing wastewater itself and the organic substance contained therein, the LAS of UV-260 spectrophotometer Spectral scan analysis, interference. In recent years, the use of anionic detergent selective electrode as the indicator electrode, potentiometric titration in the laundry wastewater in the anionic synthetic detergent has been reported, but no special reports for the bleaching and dyeing wastewater, repeated multiple standard addition method No reports. We use the liquid membrane type detergent selective electrode (referred to as AD electrode), as the endpoint indicator electrode, and with a single solution of saturated calomel electrode as the reference electrode, potentiometric titration and continuous multiple standard addition method, the determination of laundry LAS in factories and bleaching and dyeing wastewater. Detection limit of 1 mg / l (potentiometric titration); 0.1 mg / l (multiple continuous standard addition method), the coefficient of variation of ≤ 7%, the recovery rate of 92% -109%, with methylene blue UV spectrophotometry The results are consistent, with simple operation, analysis cycle is short, no solvent pollution and so on.