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本文用APDC作萃取剂,用MIBK作萃取溶剂,从pH≈4的稀土溶液中分离富集镉、钴,然后用石墨炉测定。镉的检出限是1.6×10~(-8)％,钴是7.5×10~(-8)％。用此法分析了高纯氧化钇、氧化钕、氧化镧,得到了满意的结果。由于APDC与稀土元素都不能形成稳定络合物,此法可视为测定不同稀土化合物中镉、钴的通用方法。 (一)仪器及试剂 1.仪器及测定条件:P-E2380原子吸收分光光度计;HGA-400型石墨炉;日立56型记录仪;镉、钴空心阳极灯(上海产)。镉灯电流8毫安;分析线2288埃;狭缝0.7毫微米干燥温度110℃,20秒;灰化温度350℃,20秒;原子化温度1700℃,5秒;正常加热;净化
In this paper, APDC was used as extractant and MIBK was used as extraction solvent to separate cadmium and cobalt from rare earth solution of pH≈4 and then determined by graphite furnace. The detection limit of cadmium is 1.6 × 10 ~ (-8)%, and cobalt is 7.5 × 10 ~ (-8)%. The high purity yttria, neodymium oxide and lanthanum oxide were analyzed by this method, and satisfactory results were obtained. Because APDC and rare earth elements can not form a stable complex, this method can be considered as a common method for determination of cadmium, cobalt in different rare earth compounds. (A) Instruments and reagents 1. Instruments and determination of conditions: P-E2380 atomic absorption spectrophotometer; HGA-400 graphite furnace; Hitachi 56 recorder; cadmium and cobalt hollow anode lamp (Shanghai production). Cadmium lamp current 8 mA; Analysis line 2288 angstroms; Slit 0.7 nm Drying temperature 110 ° C for 20 seconds; Ashing temperature 350 ° C for 20 seconds; Atomization temperature 1700 ° C for 5 seconds; Normal heating; Purification