GB/T 7991.10-2014 "Test methods for vitreous and porcelain enamels — Part 10: Determination of lead and cadmium release" specifies the test methods for determining the release of lead and cadmium from vitreous enamel layers. It is applicable to various types of vitreous enamel equipment, and is particularly important for equipment in contact with food and pharmaceutical products. The method involves immersing samples under simulated usage conditions and detecting the content of lead and cadmium in the immersion solution using an atomic absorption spectrophotometer or inductively coupled plasma emission spectrometer. The new standard expands the scope of application and specifies limits for the release amounts. Testing instruments must be regularly calibrated to ensure the accuracy of the data.