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Formaldehyde Test Kit

Visual Kit

Range MDL Method Type Kit Refill
0.0 - 1.0 & 1 - 10 ppm 0.1 ppm Purpald CHEMets K-4605 R-4815

CHEMetrics offers a visual test kit employing the well-known Purpald® reagent to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.

The Purpald Method

Purpald® is subject to fewer interferences than Schiff's reagent or chromotropic acid procedures. This method develops a purple color in direct relation to the concentration of formaldehyde present in the sample. A purple-coloured complex is formed when Purpald in alkaline solution reacts with formaldehyde. Results are expressed as ppm (mg/l) CH2O.

Shelf-life of the Purpald Reagent: five months. We recommend stocking quantities that will be used within four months.

Purpald® developed by Aldrich Chemical Co.

Technical Data Sheet


Formaldehyde is used in a variety of industrial processes and products. Approximately half of all formaldehyde manufactured is used in the production of formaldehyde-based resins such as urea, phenolic, and melamine resins. These resins are used in the manufacture of various products including composite and engineered wood products, including cabinets, counter tops, moldings, furniture, stairs, wood flooring, beams, trusses and sheathing, as well as paper and tissue product coatings, and fertilisers. Formaldehyde resins are decreasingly used in kitchenware and domestic foam insulation on account of health concerns. Formaldehyde is also used in biological specimen preservation and in food, medicine and cosmetic preservatives. It is also used in medical equipment disinfectants, and household antiseptic products. Formaldehyde is also used in metal electroplating baths and textile treatments.

While formaldehyde is commonly found as a gas, it can also contaminate surface water. Formaldehyde enters water through industrial discharge, leaching from certain plumbing fixtures, or from disinfection by-products. Industrial wastewater monitoring for formaldehyde is often required to ensure it is not released into the environment.

What is Formaldehyde?

Formaldehyde (CH2O) is a colourless, flammable and toxic gas at room temperature, and has a very pungent aroma. Formaldehyde is naturally occurring in trace amounts in a variety of plants and animal tissue. It is also produced industrially on a large scale. Commercially produced formaldehyde is often stored as an aqueous solution called formalin since formaldehyde gas is readily soluble in water. Products containing formaldehyde resin release formaldehyde into the air in a process known as offgassing. Formaldehyde is also produced as a product of combustion of petrol, natural gas, wood and tobacco, and can be found in motor vehicle exhaust emissions. Formaldehyde is toxic to humans and has been classified as a human carcinogen based on animal studies where it was found to cause cancer.