摘要
目前测定铅的分析方法主要有分光光度法、阳极溶出伏安法、示波极谱法、原子吸收法等。针对比色法灵敏度低，试剂不稳定；电化学法干扰严重；而原子吸收法，线性范围窄，样品用量大等问题，江苏油田采用氢化物发生原子荧光法测定钻井废水中的铅。样品经HNO3-HClO4消解，3％～4％KBH4还原，以0.8％～1.5％的HCl为介质，加入10％K3Fe(CN)6和2％H2C2O4基体改进剂，用原子荧光法连续测定钻井废水中的铅。铅的检测限为0.61ng/mL,回收率为87.4％～146％，变异系数＜4.2％。该方法操作简单，灵敏度高。
Recent analytic methods for measuring lead include mainly spectrophotometry, anodic stripping voltammetry, oscilloscopic polarography, atomic absorption method etc. These methods have some problems, like low sensitivity of colorimetric method with instability of reagent, serious interference of electrochemical method, narrow linear range and large number of samples required of atomic absorption method. The method of hydrogenate forming atomic fluorescence is adopted to measure lead content in drilling water. The sample is digested in HNO3-HClO4, reduced with 3%-4% KBH4, 0.8%-1.5% of HCL is used as medium with an addition of 10% K3Fe(CN)6 and 2% H2C2O4 as matrix improver. Then lead in drilling waste water is measured continuously by atomic fluorescence method. The measurement limit of lead is 0.61ng/ml, the recovery rate is 87.4%-146%, changeability ratio <4.2%. This method is easy to operate with high sensitivity.
出处
《油气田环境保护》
CAS
2000年第4期22-23,共2页
Environmental Protection of Oil & Gas Fields
关键词
原子荧光光度法
钻井废水
铅
治理
atomic fluorescence method
drilling waste water
lead
treatment
