This standard specifies a rapid and accurate test method for determining the nitrogen content in natural raw rubber and latex using the micro-Dumas combustion method. This method converts the nitrogen in the sample into nitrogen gas through high-temperature combustion and then measures its content using a specific detector. Compared to the traditional Kjeldahl method, it is safer, more environmentally friendly, and more efficient. The primary detection instrument is a micro-Dumas combustion analyzer, which consists of a high-temperature combustion furnace with precise temperature control, a reduction tube for converting nitrogen oxides, and a detector (typically a thermal conductivity detector) for measuring nitrogen gas content, requiring high-purity helium as the carrier gas.