分光光度法测定废水中草甘膦的探讨

探讨了亚硝基衍生化紫外分光光度法测定废水中草甘膦的适用性,考察了硫酸加入体积对亚硝化反应的影响,提出应根据样品碱度调整硫酸用量。方法与高效液相色谱法测定值的重现性较好,应用于实际废水中草甘膦测定的加标回收率为95%～105%,平行测定的RSD≤1.3%,检出限为0.069 mg/L,检测上限为50.0 mg/L,废水中可能存在的伯胺和叔胺类物质对测定无明显干扰。

Discussion on Determination of Glyphosate in Wastewater by Spectrophotometry

The applicability was discussed on determination of glyphosate in wastewater by nitroso-group derivatives ultraviolet spectrophotometry.According to affection degree of sulfuric acid volume on nitroso-group reaction,the number of sulfuric acid quantity was added by sample pH value.The test result of the method was similar to that HPLC method did.Spiked recoveries of wastewater samples in glyphosate detection ranged from 95% to 105%,RSD of replicate test ≤1.3%,detection limits 0.069 mg/L,upper limits of concentration 50.0 mg/L.That methylamines and tertiaryamines might be existed in wastewater would not obviously interfere in the glyphosate determination.