Ohashi Akira, Ito Hiromi, Kanai Chikako, Imura Hisanori, Ohashi Kousaburo
Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito 310-8512, Japan.
Talanta. 2005 Jan 30;65(2):525-30. doi: 10.1016/j.talanta.2004.07.018.
The cloud point extraction behavior of iron(III) and vanadium(V) using 8-quinolinol derivatives (HA) such as 8-quinolinol (HQ), 2-methyl-8-quinolinol (HMQ), 5-butyloxymethyl-8-quinolinol (HO(4)Q), 5-hexyloxymethyl-8-quinolinol (HO(6)Q), and 2-methyl-5-octyloxymethyl-8-quinolinol (HMO(8)Q) and Triton X-100 solution was investigated. Iron(III) was extracted with HA and 4% (v/v) Triton X-100 in the pH range of 1.70-5.44. Above pH 4.0, more than 95% of iron(III) was extracted with HQ, HMQ, and HMO(8)Q. Vanadium(V) was also extracted with HA and 4% (v/v) Triton X-100 in the pH range of 2.07-5.00, and the extractability increased in the following order of HMQ < HQ < HO(4)Q < HO(6)Q. The cloud point extraction was applied to the determination of iron(III) in the riverine water reference by a graphite furnace atomic absorption spectroscopy. When 1.25 x 10(-3)M HMQ and 1% (v/v) Triton X-100 were used, the found values showed a good agreement with the certified ones within the 2% of the R.S.D. Moreover, the effect of an alkyl group on the solubility of 5-alkyloxymethyl-8-quinolinol and 2-methyl-5-alkyloxymethyl-8-quinolinol in 4% (v/v) Triton X-100 at 25 degrees C was also investigated.
研究了使用8-羟基喹啉衍生物（HA）如8-羟基喹啉（HQ）、2-甲基-8-羟基喹啉（HMQ）、5-丁氧基甲基-8-羟基喹啉（HO(4)Q）、5-己氧基甲基-8-羟基喹啉（HO(6)Q）和2-甲基-5-辛氧基甲基-8-羟基喹啉（HMO(8)Q）以及Triton X-100溶液对铁（III）和钒（V）的浊点萃取行为。在pH值为1.70 - 5.44范围内，铁（III）用HA和4%（v/v）Triton X-100进行萃取。在pH高于4.0时，超过95%的铁（III）能用HQ、HMQ和HMO(8)Q萃取。钒（V）也在pH值为2.07 - 5.00范围内用HA和4%（v/v）Triton X-100进行萃取，其萃取率按HMQ < HQ < HO(4)Q < HO(6)Q的顺序增加。将浊点萃取应用于通过石墨炉原子吸收光谱法测定河流水标准物质中的铁（III）。当使用1.25×10⁻³M HMQ和1%（v/v）Triton X-100时，所测值与认定值在相对标准偏差的2%范围内显示出良好的一致性。此外，还研究了烷基对5-烷氧基甲基-8-羟基喹啉和2-甲基-5-烷氧基甲基-8-羟基喹啉在25℃下于4%（v/v）Triton X-100中溶解度的影响。
