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铜试剂分离-偶氮胂Ⅲ光度法测定稀土总量,具有干扰少、准确可靠的优点,但其稳定性欠佳,需要逐个显色测定是其不足。其稳定性差的主要原因在于以氟化物退色的空白不稳定及铬的影响。为此我们在这两方面进行改进,使其在不赶铬的情况下可稳定1小肘左右,从而可进行成批显色测定。一试剂溶样酸:根据不同试样可采用盐酸、硝酸、或不同比例之盐硝混合酸; 不同pH之乙酸溶液:取乙酸(1+7)200毫升数份,以浓氨水分别调至pH2.5(不加氨水)、3.0、3.5、4.1、4.5、4.7(用pH计或精密pH试纸试之); 铜试剂(二乙胺硫代甲酸钠,以下简称为DDTC
The separation of copper reagent - arsenazo Ⅲ spectrophotometric determination of total rare earth, with less interference, accurate and reliable advantages, but its stability is poor, the need for each color determination is its deficiency. The main reason for its poor stability lies in the fade of the fluoride blank instability and the impact of chromium. For this reason, we made improvements in these two aspects so that they can be stabilized to about 1 cm without catching up with chromium, thus making batch colorimetric determination possible. A reagent solution of sample acid: According to different samples can be used hydrochloric acid, nitric acid, or different proportions of salt and nitrate mixed acid; different pH of the acetic acid solution: take acetic acid (1 +7) 200 ml, with concentrated ammonia were adjusted to pH2 .5 (without ammonia), 3.0, 3.5, 4.1, 4.5, 4.7 (pH meter or precision pH test paper); copper reagent (diethylamine thiocarbamate, hereinafter referred to as DDTC