【摘要】 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%。更多还原

【Abstract】 The hydride generation-atomic fluorescence method was set up by which the lead and arsenic in the reagent were determined.Liquid chemical reagents(such as HCl,H2SO4,HNO3,etc) and solid chemical reagents(such as NaOH,K2Cr2O7,KMnO4,etc) were treated by the method of the oxidation-reduction,acid and alkali.And the pretreatment method for the sample was established.The following topics were researched as follows: the reasonable curve fitting range about the determination of lead and arsenic,the correlation of lamp current,negative high voltage,flow volume of carrier gas,flow volume of shielded gas and fluorescent intensity,the interference of background components and the effects of the kinds of acid and acidity on the experiment results.The results showed that the method was simple,quick and exact.The linear ranges of lead and arsenic were 0-40ug/L and 0-40ug/L respectively.The correlative coefficients of lead and arsenic were 0.9999 and 0.9998 respectively.The relative deviation was less than 1.0%,and the recovery rate were 99.18% and 100.78% respectively.更多还原