论文部分内容阅读
建立了一套应用氢化物发生-原子荧光法测定化学试剂中铅、砷含量的方法。对液体类型化学试剂(如HC l、H2SO4、HNO3等)和固体类型化学试剂(如NaOH、K2Cr2O7、KMnO4等)分别采用氧化还原、酸碱处理等方法进行处理,建立了样品的前处理方法。研究了测定样品中铅、砷的合理曲线拟合范围,仪器灯电流、负高压、载气流量、屏蔽气流量与荧光强度的相关性,共存背景物质的干扰情况,以及测定过程中酸的种类及酸度大小对试验结果的影响。结果表明,此方法简便、快速、准确。测定铅、砷的线性范围分别在0~40ug/L和0~40ug/L,相关系数分别为0.9999和0.9998。相对偏差小于1.0%,加标回收率分别为99.18%、100.78%。
A set of method for the determination of lead and arsenic in chemical reagents by hydride generation-atomic fluorescence spectrometry was established. The liquid type chemical reagents (such as HC1, H2SO4, HNO3, etc.) and solid type chemical reagents (such as NaOH, K2Cr2O7, KMnO4, etc.) were treated by methods such as oxidation and reduction, acid and alkali treatment to establish a sample pretreatment method. The reasonable curve fitting range, instrument lamp current, negative pressure, carrier gas flow, shielding gas flow and fluorescence intensity, the interference of coexisting background substances and the types of acid in the determination process were studied. And acidity on the test results. The results show that this method is simple, fast and accurate. The linear range of determination of lead and arsenic was 0 ~ 40 ug / L and 0 ~ 40 ug / L, respectively. The correlation coefficients were 0.9999 and 0.9998, respectively. The relative deviation was less than 1.0%, and the recoveries were 99.18% and 100.78% respectively.