發(fā)布時(shí)間：2018-06-23 02:59

  本文選題：標(biāo)準(zhǔn)加入法 + 氯離子選擇性電極��； 參考：《冶金分析》2017年04期

【摘要】：采用HNO_3(1+2)溶解樣品,氯則全部以Cl~-形式溶解于溶液中,通過測(cè)定溶液中Cl~-質(zhì)量濃度,即可計(jì)算出碳酸稀土中氯含量。試驗(yàn)探討了在以硝酸鉀和檸檬酸三鈉為總離子強(qiáng)度調(diào)節(jié)緩沖溶液(TISAB)體系中,主要以EDTA溶液絡(luò)合稀土離子,采用氯離子選擇性電極-標(biāo)準(zhǔn)加入法測(cè)定碳酸稀土中氯含量的方法。結(jié)果表明:溶液中Cl~-質(zhì)量濃度在2.0~40.0mg/L范圍內(nèi),EDTA溶液和TISAB溶液用量均為10mL,Cl~-質(zhì)量濃度的負(fù)對(duì)數(shù)與相應(yīng)電極電位(E)呈良好線性關(guān)系,線性相關(guān)系數(shù)為0.999 9;為保證測(cè)試結(jié)果的準(zhǔn)確性,樣品和電極響應(yīng)斜率S值的測(cè)定須在同一恒溫體系下進(jìn)行;方法檢出限為0.947mg/L;對(duì)于5mg/L的Cl~-,大量K~+、Na~+、NO_3~—不干擾Cl~-的測(cè)定,RE~(3+)、Ca~(2+)、Fe~(2+)、Na~+最大允許量分別為10.0、4.0、5.5、23g/L。按照實(shí)驗(yàn)方法測(cè)定碳酸鑭和混合碳酸稀土中氯,結(jié)果的相對(duì)標(biāo)準(zhǔn)偏差(RSD,n=5)均小于5%;測(cè)定值與氯化銀比濁法的測(cè)定值基本一致。
[Abstract]:HNO3 (12) was used to dissolve the sample, and chlorine was dissolved in the solution in the form of Cln-. The chlorine content in rare earth carbonate can be calculated by determining the concentration of Cln- in the solution. In the system of potassium nitrate and trisodium citrate as total ion intensity adjusting buffer solution (TISAB), the method of chloride-selective electrode and standard addition method was used to determine the chlorine content in rare earth carbonate by complexing rare earth ions with EDTA solution. The results show that the negative logarithm of the concentration of EDTA and TISAB in the range of 2.0 渭 g / L and 10 mL / L of TISAB has a good linear relationship with the corresponding electrode potential (E), and the linear correlation coefficient is 0.999, in order to ensure the accuracy of the test results, The detection limit of the method is 0.947 mg / L, and for the 5mg / L Cli, a large amount of K ~ + Na ~ no _ 3O _ 3N ~ (3) -no _ (2) Ca ~ (2) Fe ~ (2) Na ~ (2) Na ~ (2) Na ~ (2) Na ~ (2) Na ~ (2) N ~ (2) is 10.0 ~ (4. 0) ~ 5. 5 ~ (23) g 路L ~ (-1) 路L ~ (-1) for 5 mg 路L ~ (-1) Cl ~ (-1). The determination of chlorine in lanthanum carbonate and mixed rare earth carbonate by the experimental method shows that the relative standard deviation (RSD) of the results is less than 5, and the determination value is basically the same as that determined by the silver chloride turbidimetric method.
【作者單位】： 贛州有色冶金研究所;江西離子型稀土工程技術(shù)研究有限公司;
【分類號(hào)】：TQ133.3;O657.15

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊鳳麗,王朝新,鄧佐國(guó),徐廷華;高釔碳酸稀土凈化除雜研究[J];南方冶金學(xué)院學(xué)報(bào);2002年02期

2 李學(xué)舜;楊國(guó)勝;吳文遠(yuǎn);涂贛峰;;碳酸稀土晶粒粉碎過程計(jì)算機(jī)數(shù)值模擬[J];稀土;2005年06期

3 童兆達(dá);碳酸稀土轉(zhuǎn)型制備氟化稀土[J];稀土;1987年01期

4 王玉巧;;碳酸稀土市場(chǎng)前景看好[J];稀土信息;1993年12期

5 喻慶華,李先柏;晶型碳酸稀土的形成及其影響因素[J];中國(guó)稀土學(xué)報(bào);1993年02期

6 柳凌云;劉磊;謝軍;代永久;趙軍;許國(guó)華;王永利;;碳酸氫銨沉淀法制備少釹碳酸稀土粒度研究[J];稀土;2013年06期

7 冷忠義,劉石政,馬瑩,許延輝,王文斌,郝先庫(kù),白彥,范明洋,黃繼民,吳U，

本文編號(hào)：2055451