摘要
研究了 SO_4^(2-)对 Zr、CAS 与 CTMAB 之间反应的催化作用。建立了动力学光度法测定 SO_4^(2-)的新方法。方法的灵敏度高,摩尔吸光系数为1.0×10~5。测定波长为640nm。测定范围为0～20ppm。Fe(Ⅲ)、Al、Sn(Ⅱ)、V(Ⅴ)、F^-,PO_4^(3-)、AsO_4^(3-)干扰测定。Al、Fe 等阳离子可通过阳离子交换柱除去。F^-、PO_4^(3-)、AsO_4^(3-)的干扰可加入适量的 MgO 消除。用于化学试剂中微量 SO_4^(2-)的测定,效果较好。
A direct spectrophotometric method isproposed for the determination of sulphate,basedon its ability to catalyse the slow reactionbetween CAB and Zr in slightly aged solution.Sulphate may be determined in the range of 0～ 20.0 ppm by the recommended procedure with anet molar absorptivity of 1.0×10~5l·mol^(-1)·cm^(-1)at 640 nm.The colour development time is 40min.The interference of 30 other ions wasstudied.Of these,Fe(Ⅲ),Al,Sn(Ⅱ),V(V)F^-,PO_4^(3-)and AsO^(3-) interfered.Cationic inter-ferences may be removed by cation-exchange.The interference of AsO_4^(3-), F^-and PO_4^(3-) maybe removed by preliminary treatment with mag-nesium oxide
出处
《化学试剂》
CAS
CSCD
北大核心
1990年第3期139-142,184,共5页
Chemical Reagents
