Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish

LU Qianshu; LIU Zhenchao; ZENG Shixiu; SONG Anbang; LI Zhixiong; ZHANG Song; ZHANG Shuai; LAN Mingguo

doi:10.15898/j.cnki.11-2131/td.202201180013

2023 Vol. 42, No. 1

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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[J]. Rock and Mineral Analysis, 2023, 42(1): 156-166. doi: 10.15898/j.cnki.11-2131/td.202201180013

Citation:

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[J]. Rock and Mineral Analysis, 2023, 42(1): 156-166. doi: 10.15898/j.cnki.11-2131/td.202201180013

Determination of Hydrolysable Nitrogen in Soil Samples by Alkaline Hydrolysis Diffusion Separation Acid-base Titration Based on a Polypropylene Diffusion Dish

1.
Kunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, China
2.
Chengdu Analytical and Testing Center, Sichuan Bureau of Geology and Mineral Resources, Chengdu 610081, China

Received Date: 18 January 2022

Revised Date: 08 April 2022

Accepted Date: 30 April 2022

Publish Date: 28 January 2023

Abstract

Abstract

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.
- soil /
- hydrolysable nitrogen /
- polypropylene diffusion dish /
- alkaline hydrolysis diffusion separation /
- acid-base titration

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References

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