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SECTION II. APPLIED BIOTECHNOLOGY IN THE PHARMACEUTICAL INDUSTRY... 4297. Vu Thi Quynh Chi, Nguyen Cong Viet, Ngo Thi Xinh, Nguyen Thi Ngoc Anh, Luong Son Dai. The effectiveness of preparation and additives in improving the properties of c%u1ecfal sand soil on some islands belonging to the Truong sa archipelago. Journal of Chemical, Physical and Biological Analysis- Volume 27, No. 3/2022, p. 143-150%u201d. 8. Nguyen Thu Ha, Cao Thi Thanh Tam, Doan Thi Kim Hanh, Nguyen Viet Hiep, Tran Thi Thanh Thuy, Tran Tien Dung, Luong Huu Thanh, Vo Tuan Toan. %u201cImproving the production process of microorganisms used in the reclamation of coastal sand. Reporting the results of the task under the Key Program for Development and Application of Biotechnology in Agriculture and Rural Development to 2020%u201d, 2015.9. State Science and Technology Committee, 1985. Vietnamese Standard TCVN 4046:1985 on Cultivated Land - Sampling Method. 10. Ministry of Science and Technology, 2010. National Standard TCVN 8567:2010 on Soil Quality - Method for determining particle size distribution%u201d.11. Ministry of Science and Technology, 2012. National Standard TCVN 9294:2012 on Fertilizers - Determination of Total Carbon by the Walkley-Black method%u201d.12. Ministry of Science, Technology and Environment, 1999. Vietnamese Standard TCVN 6498:1999 (ISO 11261:1995) on soil quality - determination of total nitrogen - Kjeldahl method%u201d.13. National Standard TCVN 5256:2009. Soil quality %u2013 Method for determination of bioavalble phosphorus.14. Ministry of Science and Technology, 2011. National Standard TCVN 8662:2011 on Soil Quality - Method for Determining Available Potassium.