| Karat gold jewelry including 9K, 14K, 18K and 22K in China. Usually, Karat gold jewelry is made up of gold mixed with some impurity elements. Nickel can release from the high nickel content jewelry, and it can cause allergy. The relationship between the content of nickel and nickel release quantity of the karat gold were set up after the content of nickel was detected by XRF. Set a threshold of nickel release quantity of 5% in qualitative methods to test karat gold jewelry. Quantitative detect the nickel release quantity of the filtered karat gold jewelry. The results showed that, it is unnecessary to detect nickel release quantity when nickel content in Karat gold jewelry is less than 5%, part of the nickel release quantity should be detected when nickel content ranged 5%~10%, and the nickel release quantity must be detected when nickel content is higher than 10%. |
