This standard stipulates that the nitrogen content of natural rubber can be determined by the Kjeldahl semi-micro method.
GB 8088-1987 history
2008GB/T 8088-2008 Rubber,raw natural and rubber latex,natural.Determination of nitrogen content
1987GB 8088-1987 Determination of Nitrogen Content in Natural Raw Rubber
GB 8088-1987 Determination of Nitrogen Content in Natural Raw Rubber was changed to GB/T 8088-2008 Rubber,raw natural and rubber latex,natural.Determination of nitrogen content.