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本文报道了浓度为100毫克/升的阳离子、阴离子和非离子型的洗涤剂,磷酸盐,脂肪酸盐、柠檬酸,阿拉明(Alamine)-336和矿物油,不干扰 Br-PADAP 法测定铀。铁(Ⅲ)、镍(Ⅱ)、铜(Ⅱ)、铬(Ⅲ)和钒(Ⅴ)有正误差,但在通常存在于水中的浓度下不干扰。将钒(Ⅴ)还原到钒(Ⅳ)可使钒(Ⅴ)的干扰减到很小。三聚磷酸钠(100毫克/升)和焦磷酸钠(20毫克/升)严重干扰,但加入2毫克钍时,铀的回收率可回升到97—98%。NTA 和 EDTA 干扰较小,回收率达96—97%。只要水不被金属严重污染,能测定淡水中浓度为20微克/升的铀和盐水中浓度为60微克/升的铀。
In this paper, cationic, anionic and non-ionic detergents, phosphates, fatty acid salts, citric acid, Alamine -336 and mineral oil at a concentration of 100 mg / L were reported without interfering with the determination of uranium by Br-PADAP . There is a positive error in iron (III), nickel (II), copper (II), chromium (III) and vanadium (V) but does not interfere with the concentrations normally present in water. Reduction of vanadium (V) to vanadium (IV) minimizes vanadium (V) interference. Sodium tripolyphosphate (100 mg / L) and sodium pyrophosphate (20 mg / L) severely disturbed the recovery of uranium to 97-98% with 2 mg of thorium added. NTA and EDTA interference is small, the recovery rate of 96-97%. Uranium in freshwater at a concentration of 20 μg / L and uranium in brine at a concentration of 60 μg / L can be measured as long as the water is not heavily contaminated by metals.