The test paper for fast detecting formaldehyde content in aquatic product is prepared with common test paper and through cutting into strip, soaking in the reagent for 2 min, lightproof drying at room temperature and is lightproof stored. Of the reagent solution, each 100 ml contains acetylacetone in 0.5-2 ml and ammonum acetate 15-50 g. When the test paper is used, the test paper is soaked or dipped in soaking liquid of aquatic product or the soaking liquid is dropped to the test paper, and when the soaking liquid contains formaldehyde over 30 ppm, the wet test paper will change its color from white to yellow quickly with the color changing time decreasing with the increased formaldehyde content. Compared with standard color card may judge the concentration range of formaldehyde. The advantages includes no interference on detection from protein, simple test paper storing condition and fast detection.
|Published - 18 Sept 2005