酸性过硫酸钾氧化-高压锅消解测定水中总铬  

Oxidation of acidic potassium persulfate-,autoclave digestion一Determiuation of totaf chromium iu watrs

作　　者：吴春妍 蔡裕丰 Wu chunyan;Cai yufeng(Nantong Qidong ecological enwironment monitoring station.Qidong,Jiangsu)

机构地区：[1]南通市启东生态环境监测站,江苏启东226200

出　　处：《污染防治技术》2022年第5期31-34,共4页Pollution Control Technology

摘　　要：建立了酸性过硫酸钾氧化-高压锅消解测定水中总铬的方法。试验结果表明:于50 mL具塞比色管中取样25 mL,加入H_(3)SO_(4)(1+1)0.5 mL,H_(3)PO_(4)(1+1)0.5 mL,5%过硫酸钾溶液1 mL,在高压锅中于120 C,消解20 min,溶液的吸光度达最大值。显色化合物在室温(25C)显色10min,溶液吸光度达最大值。在此条件下制作的校准曲线的相关性、截距和斜率均符合质控要求,方法检出限为0.004 mg/L,精密度试验RSD≤5.44%,加标回收率为92.7%~105%,满足监测方法要求。A method for the determination of total chromium in water by acidic potassium persulfate oxidation pressure cooker digestion was established.The test results show that:Add 25 mL water sample with 50 mL colorimetric tube,mixed with 0.5 mL of sulfurice acid(1+1),0.5 mL of phosphoric acid(1+1),and 1 mL of potassium persulfate solution,and finally cut it at 120℃ in a pressure cooker for 20 minutes.The chromogenic compound develops color at room temperature for ten minutes,The absorbance of the solution reaches the maximum value.Under this condition,the correlation,intercept and slope of the calibration curve meet the quality control requirements.

关 键 词：酸性过硫酸钾氧化 高压锅消解 总铬 

分 类 号：X83[环境科学与工程—环境工程]