摘要
研究了偶氯氯膦Ⅲ（CPAⅢ）-溴化十六烷基三甲基铵（CTMAB）──α-噻吩甲酰三氟丙酮（TTA）显色体系和测定瓷土中离子吸附型稀土元素总量的条件．配合物组成比为Ce：CPAⅢ:CTMAB＝1:2:4；摩尔吸光系数εCe＝6．04×104L·mol-1·cm-1,εy＝5．45×104L·mol-1·cm-1．相对标准偏差为0．58％（n＝7）,加料回收率99％．
The colour reaction of rare earths with chlorophosphonaz Ⅲ' (CPAⅢ') cetyltrimethyl ammonium bromide (CTMAB) -α-thenoyltrifluoroacetone (TTA) system has been studied. The optimum reaction conditions for the direct determination of the total amount of ion-adsorption-type rare earths in porceIain clay are presented. The apparent molar absorptivity is 6.04× 104L· mol-1. cm-1 for Ce and 5.45 ×104L· mol-1· cm-1 for Y.The molar ratio of Ce to CPAⅢ and CTMAB in the complex is found to be 1: 2: 4. The interference of Al, Mg and other ions can be eliminated by adding a mixed masking agent of NH4F, EDTA and NH4H2PO4. The relative standard deviation of the determination is 0.58% (n=7), and the average standard addition recovery is 99%.
出处
《广东有色金属学报》
1997年第2期151-156,共6页
Journal of Guangdong Non-Ferrous Metals
关键词
瓷土
稀土
CPAⅢ
CTMAB
TTA
光度法
porcelain clay
rare earths
chlorophosphonazo Ⅲ (CPA Ⅲ ) cetyltrimethyl ammonium bromide(CTMAB)-α-thenoyltrifluoroacetone(TTA) system
spectrophotometry
