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| Optimization of total soil phosphorus determination by sodium hydroxide fusion method |
| Received:October 20, 2022 Revised:February 14, 2023 |
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| KeyWord:soil total phosphorus;sodium hydroxide fusion;temperature of fusion;acid dissolution;acidity of coloring reagent |
| Author Name | Affiliation | E-mail | | LI Xiaohan | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | DONG Zhaoyun | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | HUI Xiaoli | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | PENG Lanfang | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | ZUO Yuping | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | LIU Jinshan | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | WANG Zhaohui | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | w-zhaohui@263.net |
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| Abstract: |
| Foroptimizing the method of soil alkali fusion and its total phosphorus(TP)content, and increasing the efficiency and accuracy of TP measurement, this study focuses on the effects of the alkali fusion temperature, acids of the dissolving solution, and acidity of the reagents used in colorimetric analysis with seven soils samples collected from different regions of China. The differences in the results from different measuring instruments[continuous flow analyzer(AA3,) and inductively coupled plasma mass spectrometer(ICP-OES)] were also compared. The results showed that TP could be melted completely when the sodium hydroxide temperature reached 450℃, and therefore did not need to be increased to 720℃. Both hydrochloric acid and sulfuric acid had good solubility for molten soil samples. The results of samples dissolved in different acids changed according to the determination instruments. Samples dissolved in sulfuric acid were more suitable for AA3, while those dissolved in hydrochloric acid were more suitable for ICP-OES. In addition, the chromogenic results were more stable when the acidity of the coloring reagent was controlled between 0.53 mol·L-1 to 0.59 mol·L-1. |
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