Catalytic-kinetic Spectrophotometric Method For Rapid Determination Of Formaldehyde

Formaldehyde is an important additives used in the ornament material, drygoods, It is also a common food preservative. Formaldehyde kills viruses,bacteria,fungi and parasites and widely be used as a disinfectant and employed as chemicalintermediate in the industry synthesis of plastics. Otherwise, it is considered to be oneof the most significant industrial hazard and air pollutants. Formaldehydeconcentration exceed standard will damage the human’s health.special the child,pregnant women and old people. Frequently contact formaldehyde can cause contactallergy, bronchial diseases, allergic dermatitis,chronic poisoning, neural diseases andcarcinogenic. In2006. the International Agency for Research on Cancer hasconcluded that formaldehyde is the first kind of potential carcinogen for animals andthe carcinogenicity of formaldehyde in human.The release time of formaldehyde is so long that it is not easy to perceive whenwe choose the unqualified products. Consequently, exploring a simple, rapid andhighly sensitive method used for formaldehyde detection will have important practicalsignificance. Catalytic spectrophotometric methods can offer low-cost, simple andhighly sensitive alternatives for the determination of trace levels of environmentalpollutants. The current paper we describe some new catalytic kineticspectrophotometric method for the detection of trace formaldehyde. The measurementwas based on the formaldehyde catalytic the reaction of potassium bromate oxidationdifferent dye system. The reaction temperature, time, medium and reagentconcentration were optimized. These spectrophotometric method are simple, sable,selective and with good reproducibility. They have been applied for the determinationof trace formaldehyde and show good results.Firstly, we focused on the catalytic kinetic spectrophotometry which used as thedetection method of formaldehyde, it was found that a new catalyticspectrophotometric method which was based on the catalytic effect of formaldehydeon the reaction between potassium bromate and eosin Y. Absorbance change wasmeasured at520nm. The detection limit was0.0098μg/mL with linear range of0.03-0.6μg/mL,the linear equation was△A=0.0618+1.04936C_formaldehyde.Thecorrelation coefficient was0.9935. It has been also applied for the detection of traceformaldehyde in Shrimp, Yuba and mushroom. The results showed that the obtainedmean recovery values were97%to106%. Secondly, another new catalytic spectrophotometric method for thedetermination of formaldehyde is based on the catalytic effect of formaldehyde on theoxidation reaction of Bromocresol green by bromate in sulphuric acid medium.Absorbance change was tested at443nm. The calibration curve showed the linearrange was0.2-2.0μg/mL, the linear equation was△A=0.54378-0.14656C_formaldehyde（R=0.99912）. The detection limit was80ng/mL. The method has been applied to thedetermination of trace formaldehyde in Yuba and mushroom. The obtained meanrecovery values were92%to95%.At last, we studied a new catalytic kinetic spectrophotometric method to detectthe formaldehyde. It was based on the catalytic effect of formaldehyde on the reactionbetween potassium bromate and Malachite Green. Experimental conditions, such asreaction temperature, time, and the concentration of reagents were optimized bymeasuring the absorbance change at615nm. Under the best condition, the detectionlimit was1ng/mL. with linear range of0.003-0.08μg/mL. The linear equation was△A=0.14239+0.88764C_formaldehyde.the correlation coefficient was0.995. This methodis quick, stable and with little interferences. It has been applied for the detection intap-water and coca-cola of formaldehyde. The result is satisfactory.