Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish
BACKGROUND The traditional alkaline hydrolysis diffusion separation acid-base titration method is used to determine the hydrolysable nitrogen in soil samples. Usually, a glass diffusion dish is used for alkaline hydrolysis diffusion separation. However, during sample pretreatment and alkaline hydrol...
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2023-01-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202201180013 |
| _version_ | 1811154765412827136 |
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| author | LU Qianshu LIU Zhenchao ZENG Shixiu SONG Anbang LI Zhixiong ZHANG Song ZHANG Shuai LAN Mingguo |
| author_facet | LU Qianshu LIU Zhenchao ZENG Shixiu SONG Anbang LI Zhixiong ZHANG Song ZHANG Shuai LAN Mingguo |
| author_sort | LU Qianshu |
| collection | DOAJ |
| description | BACKGROUND The traditional alkaline hydrolysis diffusion separation acid-base titration method is used to determine the hydrolysable nitrogen in soil samples. Usually, a glass diffusion dish is used for alkaline hydrolysis diffusion separation. However, during sample pretreatment and alkaline hydrolysis diffusion separation, the operator often faces the following three problems. First, the solution in the inner chamber of the glass diffusion dish is very easily polluted by sodium hydroxide solution and alkaline glue solution. Second, ammonia leakage occurs easily between the glass diffusion dish and the cover, and it is often not possible to remedy when it is found. Third, the glass diffusion dish is bulky and fragile, and the experimental operation is inconvenient, all of which lead to the instability of measurement results due to inexperience of the operator. OBJECTIVES To establish a new method for the determination of hydrolysable nitrogen in soil samples by alkaline hydrolysis diffusion separation acid-base titration based on polypropylene diffusion dish. METHODS A polypropylene diffusion dish was used instead of a glass diffusion dish in the alkaline hydrolysis of hydrolysable nitrogen. The cleaning method and the sealing of the diffusion dish were improved. The addition amount of reducing agent and the concentration of sodium hydroxide solution (1.8mol/L) were unified. The addition volume of sodium hydroxide solution was appropriately increased, and the concentration of hydrochloric acid standard solution was reduced. RESULTS The absolute deviation of reference materials GBW07416a with the measured value of hydrolysable nitrogen < 50mg/kg was 0.2-1.8mg/kg. The absolute deviation of reference materials GBW07415a, NSA-1, NSA-4, NSA-5 and NSA-6 with the measured value of hydrolysable nitrogen of 50-200mg/kg was 0-4.0mg/kg. The recovery rate of nitrate nitrogen converted to ammonium nitrogen by reducing agent was 89.6%-96.4%. The measured value of soil available reference materials was consistent with the standard value. CONCLUSIONS The stability and accuracy of hydrolysable nitrogen determination are improved. The pollution in this method is significantly reduced, ammonia leakage is avoided, and the operation is convenient. The method meets the requirements for determining the content of hydrolysable nitrogen in soil samples. |
| first_indexed | 2024-04-10T04:21:27Z |
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| id | doaj.art-30a9ed7acf3144479883364f6bdfc9d2 |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T04:21:27Z |
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| spelling | doaj.art-30a9ed7acf3144479883364f6bdfc9d22023-03-11T02:27:07ZengScience Press, PR ChinaYankuang ceshi0254-53572023-01-0142115616610.15898/j.cnki.11-2131/td.202201180013yk202201180013Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion DishLU Qianshu0LIU Zhenchao1ZENG Shixiu2SONG Anbang3LI Zhixiong4ZHANG Song5ZHANG Shuai6LAN Mingguo7Kunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, ChinaKunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, ChinaChengdu Analytical and Testing Center, Sichuan Bureau of Geology and Mineral Resources, Chengdu 610081, ChinaChengdu Analytical and Testing Center, Sichuan Bureau of Geology and Mineral Resources, Chengdu 610081, ChinaKunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, ChinaKunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, ChinaKunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, ChinaKunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, ChinaBACKGROUND The traditional alkaline hydrolysis diffusion separation acid-base titration method is used to determine the hydrolysable nitrogen in soil samples. Usually, a glass diffusion dish is used for alkaline hydrolysis diffusion separation. However, during sample pretreatment and alkaline hydrolysis diffusion separation, the operator often faces the following three problems. First, the solution in the inner chamber of the glass diffusion dish is very easily polluted by sodium hydroxide solution and alkaline glue solution. Second, ammonia leakage occurs easily between the glass diffusion dish and the cover, and it is often not possible to remedy when it is found. Third, the glass diffusion dish is bulky and fragile, and the experimental operation is inconvenient, all of which lead to the instability of measurement results due to inexperience of the operator. OBJECTIVES To establish a new method for the determination of hydrolysable nitrogen in soil samples by alkaline hydrolysis diffusion separation acid-base titration based on polypropylene diffusion dish. METHODS A polypropylene diffusion dish was used instead of a glass diffusion dish in the alkaline hydrolysis of hydrolysable nitrogen. The cleaning method and the sealing of the diffusion dish were improved. The addition amount of reducing agent and the concentration of sodium hydroxide solution (1.8mol/L) were unified. The addition volume of sodium hydroxide solution was appropriately increased, and the concentration of hydrochloric acid standard solution was reduced. RESULTS The absolute deviation of reference materials GBW07416a with the measured value of hydrolysable nitrogen < 50mg/kg was 0.2-1.8mg/kg. The absolute deviation of reference materials GBW07415a, NSA-1, NSA-4, NSA-5 and NSA-6 with the measured value of hydrolysable nitrogen of 50-200mg/kg was 0-4.0mg/kg. The recovery rate of nitrate nitrogen converted to ammonium nitrogen by reducing agent was 89.6%-96.4%. The measured value of soil available reference materials was consistent with the standard value. CONCLUSIONS The stability and accuracy of hydrolysable nitrogen determination are improved. The pollution in this method is significantly reduced, ammonia leakage is avoided, and the operation is convenient. The method meets the requirements for determining the content of hydrolysable nitrogen in soil samples.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202201180013soilhydrolysable nitrogenpolypropylene diffusion dishalkaline hydrolysis diffusion separationacid-base titration |
| spellingShingle | LU Qianshu LIU Zhenchao ZENG Shixiu SONG Anbang LI Zhixiong ZHANG Song ZHANG Shuai LAN Mingguo Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish Yankuang ceshi soil hydrolysable nitrogen polypropylene diffusion dish alkaline hydrolysis diffusion separation acid-base titration |
| title | Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish |
| title_full | Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish |
| title_fullStr | Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish |
| title_full_unstemmed | Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish |
| title_short | Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish |
| title_sort | determination of hydrolysable nitrogen in soil samples by alkaline hydrolysis diffusion separation acid base titration based on a polypropylene diffusion dish |
| topic | soil hydrolysable nitrogen polypropylene diffusion dish alkaline hydrolysis diffusion separation acid-base titration |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202201180013 |
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