EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 3856-5 testing. The principle consists in forming a colored complex from a solution of hexavalent chromium and diphenylcarbazide. The method can be applied to coating materials with hexavalent chromium content in the range of about 0,05% (m/m) to 5% (m/m). This method is the arbitration method in cases of dispute.
Hexavalent chromium is a toxic substance that can cause a number of health problems, including lung cancer, skin irritation and allergic reactions. Therefore, measuring the amount of hexavalent chromium in paints and varnishes is important to ensure their safety.
The diphenylcarbazide spectrophotometric method involves dissolving the pigment portion of the dye in a mixture of acetic acid and acetone. The resulting solution is then treated with diphenylcarbazide, which forms a complex with hexavalent chromium, which produces a purple color. The intensity of the purple color is proportional to the amount of hexavalent chromium in the sample and can be measured using a spectrophotometer.
The ISO 3856-5 standard provides detailed instructions for performing the diphenylcarbazide spectrophotometric method, including information on equipment, reagents, sample preparation, and calculation of results. The standard also specifies limits for the maximum hexavalent chromium content allowed in paints and varnishes.
Overall, ISO 3856-5 is an important standard for ensuring the safety and quality of paints and varnishes and protecting the health of workers and consumers who may come into contact with these products.
EUROLAB assists manufacturers with ISO 3856-5 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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