液相色谱/质谱联用检测刚果红及其微电解降解的研究

LC/MS detection of Congo red dyeing wastewater and its degradation by micro-electrolysis

采用液相色谱/质谱联用(LC/MS)检测了模拟印染废水中的刚果红,并用微电解对其进行了降解研究。LC/MS检测刚果红的结果表明,在流动相为甲醇∶水(体积比)=70∶30、流速为0.6 mL/min、色谱柱为Zorbax XDB-C18(150 mm×4.6 mm,5μm)条件下,刚果红的准分子离子的质荷比(m/z)为325;该方法的检出限为0.1 mg/L,线性范围为0.4～100.0 mg/L,r为0.991 5,相对标准偏差为8.5%～13.4%,回收率为83.5%～106.4%。微电解法降解刚果红的结果表明,在刚果红初始质量浓度为10mg/L、初始pH为3.0、保留时间为90 min的反应条件下,降解率约为85%。

Liquid chromatography-mass spectrometry（LC/MS） was applied to measure the concentration of Congo red in dyeing wastewater.The optimal detecting conditions were defined as follow： methanol-water（70∶30） as the mobile phase at a flow rate of 0.6 mL/min;Zorbax C18 column（150 mm×4.6 mm,5 μm） as isolation column;the quasi-molecular ion of Congo red was m/z 325.Results showed that the detection limits of the method was 0.1 mg/L,the linear range was between 0.4 to 100.0 mg/L with r of 0.991 5.The relative standard deviation ranged 8.5%-13.4%,and overall recoveries was between 83.5%-106.4%.The Congo red dyeing wastewater was treated by micro-electrolysis method,when the initial concentration of Congo red was 10 mg/L,initial pH value was 3.0,85% of Congo red could be degraded in 90 min.