南通职业大学学报
南通職業大學學報
남통직업대학학보
Journal of Nantong Vocational University
2015年
3期
72-75
,共4页
催化动力学%光度法%甲醛%苯酚红%溴酸钾
催化動力學%光度法%甲醛%苯酚紅%溴痠鉀
최화동역학%광도법%갑철%분분홍%추산갑
catalytic kinetic%spectrophotometry%formaldehyde%phenol red%potassium bromate
基于溴酸钾在硫酸介质中可氧化苯酚红，甲醛的加入催化该氧化反应的进行，从而使溴酸钾氧化苯酚红的速度明显加快，据此建立了测定食品中痕量甲醛的新催化动力学分光光度法，并研究了该催化褪色反应的最佳动力学条件和参数。在测定波长380 nm下，测定方法的线性范围0.02~0.32滋g/mL，检出限为6.10×10-9 g/mL。催化反应为动力学零级反应，表现活化能为38.87 kJ/mol，催化反应速率常数k=9.1×10-4s-1。运用所建立的方法测定食品中痕量甲醛，相对标准偏差小于3.9%，回收率在96.3%~105.5%，表明该方法测得的结果与乙酰丙酮光度法所测结果一致。
基于溴痠鉀在硫痠介質中可氧化苯酚紅，甲醛的加入催化該氧化反應的進行，從而使溴痠鉀氧化苯酚紅的速度明顯加快，據此建立瞭測定食品中痕量甲醛的新催化動力學分光光度法，併研究瞭該催化褪色反應的最佳動力學條件和參數。在測定波長380 nm下，測定方法的線性範圍0.02~0.32滋g/mL，檢齣限為6.10×10-9 g/mL。催化反應為動力學零級反應，錶現活化能為38.87 kJ/mol，催化反應速率常數k=9.1×10-4s-1。運用所建立的方法測定食品中痕量甲醛，相對標準偏差小于3.9%，迴收率在96.3%~105.5%，錶明該方法測得的結果與乙酰丙酮光度法所測結果一緻。
기우추산갑재류산개질중가양화분분홍，갑철적가입최화해양화반응적진행，종이사추산갑양화분분홍적속도명현가쾌，거차건립료측정식품중흔량갑철적신최화동역학분광광도법，병연구료해최화퇴색반응적최가동역학조건화삼수。재측정파장380 nm하，측정방법적선성범위0.02~0.32자g/mL，검출한위6.10×10-9 g/mL。최화반응위동역학령급반응，표현활화능위38.87 kJ/mol，최화반응속솔상수k=9.1×10-4s-1。운용소건립적방법측정식품중흔량갑철，상대표준편차소우3.9%，회수솔재96.3%~105.5%，표명해방법측득적결과여을선병동광도법소측결과일치。
A catalytic spectrophotometric method for the determination of trace formaldehyde is established based on the inhibitory effect of formaldehyde on the oxidation of phenol red by potassium bromate in H2SO4 medium. The optimum kinetic condition of the catalytic reaction has been investigated. The wavelength for the determination is 380 nm, and the linear range for determination of formaldehyde is 0.02~0.32 μg/mL with the detection limit of 6.10×10-9 g/mL.v The results from the studies suggest that the catalytic reaction is zero-or-der and the apparent activation energy of this reaction is 38.87 kJ/mol,and the apparent rate constant is k=9.1×10-4s-1. The procedure has been used to determine formaldehyde in foods, with the relative standard devi-ation of below 3.9%and the average recovery of 96.3 %~105.5 %. Results obtained by this method are con-sistent with the results found by the acetylacetone photometry.
