CHEMets รหัส K-4605 ชุดทดสอบคุณภาพน้ำค่าฟอร์มาลดีไฮด์,Dissolved formaldehyde(CH2O) testing visual kit,meas.range: 0～1ppm&1～10ppm

Formaldehyde, a toxic substance, is used in the following applications: metal plating baths, textile treatments, biological specimen preservatives, and disinfectants of medical equipment. Commercial formaldehyde gas is readily soluble in water. The Purpald Method . Reference: Purpald developed by Aldrich Chemical Co. Purpald is subject to fewer interferences than Shiffs' reagent or chromotropic acid procedures. A purplecolored complex is formed when Purpald in alkaline solution reacts with formaldehyde. Results are expressed as ppm (mg/L) CH2O. Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, Activator Solutions, 25 mL sample cup, and instructions. Range: 0-1 & 1-10 ppm. MDL: 0.1 ppm. Method: Purpald. Shelf-life: The refill contained in this kit has a shelf-life of 5 months.