广州化工
廣州化工
엄주화공
Guangzhou Chemical Industry
2015年
17期
149-150,197
,共3页
催化动力学分光光度法%EDTA%甲基红%过氧化氢
催化動力學分光光度法%EDTA%甲基紅%過氧化氫
최화동역학분광광도법%EDTA%갑기홍%과양화경
cataiysis kinetic spectrophotometric method%EDTA%methyl red%hydrogen peroxide
鉴于在盐酸介质中, EDTA对过氧化氢氧化甲基红反应具有明显的催化作用,据此建立了一种新的测定EDTA的催化动力学分光光度法。研究了该催化褪色反应的动力学条件和参数。在测定波长520 nm下,测定方法的线性范围1.0~9.0μg/25 mL,检出限为2.76×10-9 g/mL。催化反应为动力学零级反应,表现活化能为38.72 kJ/mol,表观反应速率常数1.21×10-3 s-1。该方法用于电厂锅炉清洗废水EDTA的测定,相对标准偏差小于3.8%,试样加标回收率为95.5%~106.0%。
鑒于在鹽痠介質中, EDTA對過氧化氫氧化甲基紅反應具有明顯的催化作用,據此建立瞭一種新的測定EDTA的催化動力學分光光度法。研究瞭該催化褪色反應的動力學條件和參數。在測定波長520 nm下,測定方法的線性範圍1.0~9.0μg/25 mL,檢齣限為2.76×10-9 g/mL。催化反應為動力學零級反應,錶現活化能為38.72 kJ/mol,錶觀反應速率常數1.21×10-3 s-1。該方法用于電廠鍋爐清洗廢水EDTA的測定,相對標準偏差小于3.8%,試樣加標迴收率為95.5%~106.0%。
감우재염산개질중, EDTA대과양화경양화갑기홍반응구유명현적최화작용,거차건립료일충신적측정EDTA적최화동역학분광광도법。연구료해최화퇴색반응적동역학조건화삼수。재측정파장520 nm하,측정방법적선성범위1.0~9.0μg/25 mL,검출한위2.76×10-9 g/mL。최화반응위동역학령급반응,표현활화능위38.72 kJ/mol,표관반응속솔상수1.21×10-3 s-1。해방법용우전엄과로청세폐수EDTA적측정,상대표준편차소우3.8%,시양가표회수솔위95.5%~106.0%。
A catalytic spectrophotometric method for the determination of trace EDTA was speeded up based on the cataiysis effect of EDTA on the oxidation of methyl red by hydrogen peroxide in hydrochloric acid medium. The optimum kinetic conditions of the catalytic reaction were investigated. The wavelength for the determination was 520 nm. The linear range for determination of EDTA was 1. 0~9. 0 μg/25 mL with the detection limit of 2. 76 ×10-9 g/mL. The results from the studies suggested that the catalytic reaction was zero-order and the apparent activation energy of this reaction was 38. 72 kJ/mol, and the apparent rate constant was 1. 21×10-3 s-1. The procedure was used to determine to clean waste water in EDTA of power station boiler, with the relative standard deviation of below 3. 8% and the average recovery of 95. 5% ~106. 0%.
