β-环糊精存在下氯化铁褪色光度法测定微量氟 |
| |
引用本文: | 李咏梅,李人宇,付培楠,张龙.β-环糊精存在下氯化铁褪色光度法测定微量氟[J].冶金分析,2010,30(3):50-52. |
| |
作者姓名: | 李咏梅 李人宇 付培楠 张龙 |
| |
作者单位: | 淮海工学院化学工程学院;淮海工学院江苏省海洋资源开发研究院;连云港师范高等专科学校; |
| |
基金项目: | 连云港市科技项目,江苏省海洋资源开发研究院科技开放基金 |
| |
摘 要: | β-环糊精存在下,在pH 1.6的KCl-HCl缓冲溶液中,F-与FeCl3反应生成白色结晶性络盐使溶液褪色,据此建立了褪色光度法测定氟的新方法。络合物的最大褪色波长为263nm,体系的褪色程度与F-浓度在0~10.0 mg/L范围内呈线性关系,检出限为47.9μg/L。大量金属离子的干扰采用蒸馏法分离或8-羟基喹啉沉淀法去除;MnO4-、Cr2O72-和VO3-的干扰用抗坏血酸掩蔽。方法用于测定磷矿和药厂工序废水中氟时,PO43-和Ca2+的干扰用蒸馏法分离去除,相对标准偏差小于2.3%(n=5),平均回收率为98%~102%。
|
关 键 词: | 褪色光度法 氟 氯化铁 β-环糊精 磷矿 工序废水 |
Fading spectrophotometric determination of trace fluorine with ferric chloride in the presence of β-cyclodextrin |
| |
Abstract: | A new fading spectrophotometric method was developed for the determination of fluorine. The method is based on the reaction between F~- and FeCl_3 in KCI-HCI buffer solution at pH 1-6 in the presence of β-cyclodextrin, which forms white crystalline complex salt, resulting in fading of the solution. The maximum fading wavelength lo-cated at 263 nm. The system's fading degree was linear with the concentration of F~- in the range of 0-10. 0 mg/L. The detection limit was 47. 9 μg/L. Many metal ions could be separated by distillation or precipitation with 8-hydroxyquinoline. Interfering ions of MnO_4, Cr_2 O_7~(2-) and VO_3 could be masked by ascorbic add. The method was applied to determine fluorine in phosphorus ore sample and wastewater sample of working procedure from pharma-ceutical factory, and the interfering ions of PO_4~(3-) and Ca~(2+) were separated by distillation. The relative standard devi-ation was no larger than 2. 3 % (n = 5), and the average recovery was in the range of 98 %-102 %. |
| |
Keywords: | fading spectrophotometry fluorine ferric chloride phosphorus ore wastewater of working procedure |
本文献已被 CNKI 万方数据 等数据库收录! |
| 点击此处可从《冶金分析》浏览原始摘要信息 |
|
点击此处可从《冶金分析》下载全文 |
|