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30毫升N_(235)(大连化工厂产。与二甲苯等容混合)与45克DA201吸附树脂(天津乳胶厂产,40～60目)调制后,在红外灯下烘干。水浸润、装入φ1.0×11.5cm色谱柱中.用20毫升6N硝酸以1.5毫升·分~(-1)的流速通过固定相。0.1～0.5克矿样经过氧化钠熔后,用6N硝酸(10～20毫升)溶解,取全量或分液进柱,待流至与固定相平齐、以20毫升6N硝酸分两次进柱淋洗。用6N盐酸洗脱钍,导前的6毫升弃去、收集后18毫升于加有1毫升10%尿素-5%抗坏血酸的25毫升量瓶中,加10%草酸1毫升、乙醇2.5毫升、摇动至不再发生气泡,加0.05%偶氮胂Ⅲ2毫升,
30 ml N 235 (manufactured by Dalian Chemical Industry Co., Ltd., mixed with xylene isomerization) and 45 g of DA201 adsorption resin (produced by Tianjin Latex Factory, 40-60 mesh) were dried under infrared lamp. Water infiltrated into a φ1.0 × 11.5 cm column and passed through the stationary phase with 20 ml of 6 N nitric acid at a flow rate of 1.5 ml · min -1. 0.1 ~ 0.5g ore samples after sodium oxide melt, with 6N nitric acid (10 ~ 20 ml) dissolved, take the full amount or liquid into the column until the flow and flush with the stationary phase, with 20 ml of 6N nitric acid into the column twice Rinse. Thorium was eluted with 6N hydrochloric acid and the first 6 ml was discarded. After the collection, 18 ml of 25 ml volumetric flask containing 1 ml of 10% urea-5% ascorbic acid was added, and 1 ml of 10% oxalic acid and 2.5 ml of ethanol were shaken To no longer occur bubbles, add 0.05% arsenazo Ⅲ 2 ml,