浊点萃取分离-光度法测定水中痕量钼
Photometric Determination of Trace Amount of Molybdenum(Ⅵ) in Water with Separation by Cloud Point Extraction
摘 要
水样中痕量钼(Ⅵ)在4.0×10-3mol·L-1盐酸溶液中,并在10 mL总体积中0.1 g Triton X-114存在的条件下,与1.0 mL的1.0×10-3mol·L-1苯基荧光酮(PF)溶液反应,并在75 ℃水浴中加热25 min后离心2 min实施浊点萃取分离.除去上层水相后,于下层胶束相中加入0.02 mol·L-1盐酸溶液0.4 mL,定容为2.0 mL,在其吸收峰523 nm波长处,以试剂空白作参比测定其中钼(Ⅵ)-PF络合物的吸光度.方法的线性范围在20~140 μg·L-1之间,其检出限(3S/N)为12 μg·L-1.
浊点萃取
钼(Ⅵ)
苯基荧光酮
Photometry
Cloud-point extraction
Molybdenum(Ⅵ)
Phenylfluorone
Abstract
Traces of molybdenum(Ⅵ) in water was reacted with 1.0 mL of 1.0×10-3mol·L-1 phenylfluorone (PF) solution in 4.0×10-3mol·L-1 HCl solution in the presence of 0.1 g of Triton X-114 per 10 mL of reaction solution.Cloud point extraction was applied to the reaction mixture by heating for 25 min at 75 ℃ in water bath,and centrifuging for 2 min to separate the phases.The upper aqueous phase was removed,and the absorbance of the Mo(Ⅵ)-PF complex in the lower micellar phase (after adding 0.4 mL of 0.02 mol·L-1 HCl and diluting quantitatively to 2.0 mL) was measured at the wavelength of its absorption maxium (523 nm) with reference to reagent blank.Range of linearity was kept between 20 and 140 μg·L-1 of Mo(Ⅵ),with detection limit (3S/N) of 12 μg·L-1.
中图分类号 O657.32
所属栏目 工作简报
基金项目 国家自然科学基金资助项目(20875082)
收稿日期 2009/12/24
修改稿日期
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备注车音(1960-),女,吉林扶育人,讲师,主要研究方向为化学教育.
引用该论文: CHE Yin,CHEN Song-qing,ZHU Xia-shi. Photometric Determination of Trace Amount of Molybdenum(Ⅵ) in Water with Separation by Cloud Point Extraction[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2010, 46(6): 618～620
车音,陈松庆,朱霞石. 浊点萃取分离-光度法测定水中痕量钼[J]. 理化检验－化学分册, 2010, 46(6): 618～620
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【2】程相恩,王风,梁德俊,等.混合表面活性剂增敏火焰原子吸收测定地质样品中的钼[J].中国钼业,2008,32(3):30-32．
【3】黄天壁.原子吸收法测定矿石中的钼[J].云南冶金,2009,37(1):53-56．
【4】崔毅,史柏川,白淑珍,等.分光光度法测定蒙药黑冰片中微量钼[J].光谱实验室,2008,25(4):592-594．
【5】李坤威,孔晓朵,刘奇.水中痕量钼(Ⅵ)的4-(2-吡啶偶氮)-间苯二酚螯合活性炭吸附富集分光光度法测定[J].分析测试学报,2003,22(2):81-83．
【6】GHIASVAND A R,SHADABI S,MOHAGHEGHZADEH E,et al.Homogeneous liquid-liquid extraction method for the selective separation and preconcentration of ultra trace molybdenum[J].Talanta,2005,66(4):912-916．
【7】BELLATO A C,GERVASIO A P,GIN′E M F.Cloud-point extraction of molybdenum in plants and determination by isotope dilution inductively coupled plasma mass spectrometry[J].J Anal At Spectrom,2005,20:535-537．
【8】GAMBAROV D G,KHALILOVA F G,NAGIEV K D.Spectrophotometric determination of molybdenum(Ⅵ) with bromopyrogallol red in the presence of Triton X-114[J].J Anal Chem,2006,61(7):638-640．
【9】MADRAKIAN T,GHAZIZADEH F.Cloud-point preconcentration and spectrophotometric determination of trace amounts of molybdenum(Ⅵ) in steels and water samples[J].J Hazard Mater,2008,153(1):695-700．
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