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.
C-4610, High Range Formaldehyde Comparator, 1-10 ppm
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.