Method for measuring soil ammonium nitrogen
A technology of ammonium nitrogen and soil, which is applied in the field of analysis and testing of soil ammonium nitrogen, can solve the problems that it is impossible to completely remove the ammonia nitrogen of the filter paper, affect the accuracy of the measurement results, and qualitative filter paper filtration errors, etc., so as to shorten the filtration time and save Drugs, easy-to-handle effects
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Embodiment 1
[0016] The first step, the extraction of soil sample ammonium nitrogen test solution: Weigh 5g of fresh soil sample and place it in a 100ml Erlenmeyer flask, add 25ml of NaCl aqueous solution with a mass percentage concentration of 20±0.5%, and shake it on a shaker at 150±20r / The shaking rate of min was shaken for 40-60 minutes to obtain the soil sample ammonium nitrogen to be tested extract;
[0017] The second step, centrifugation: transfer the soil sample ammonium nitrogen test extract to a 50ml polyethylene centrifuge tube, and centrifuge at 3000-5000 rpm for 5-10min;
[0018] The third step is to process the extract: transfer the supernatant obtained by the above centrifugation to a test tube, and add 0.1 ± 0.005 ml of zinc sulfate with a mass percentage concentration of 10 ± 0.5% for every 10-30 ml of soil supernatant in turn Aqueous solution and 0.1-0.3ml of sodium hydroxide aqueous solution with a mass percentage concentration of 25±0.5% are used for flocculation and ...
Embodiment 2
[0035] The first step is to extract the ammonium nitrogen test solution of the soil sample: Weigh 1g of the fresh soil sample and put it into a 100ml Erlenmeyer flask, add 25ml of NaCl aqueous solution with a mass percentage concentration of 20±0.5%, and shake it on the shaker at 160r / min Extract by shaking at a rate of 50 minutes to obtain the soil sample ammonium nitrogen test solution;
[0036] The second step, centrifugation: transfer all the extracts to a 50ml polyethylene centrifuge tube, and perform centrifugation at 4000 rpm for 8 minutes;
[0037] The third step is to process the extract: transfer the supernatant obtained by centrifugation to a test tube, add 0.3±0.005ml of zinc sulfate aqueous solution with a concentration of 10±0.5% by mass percentage and 0.2ml of an aqueous solution of zinc sulfate with a concentration of 25±0.5% by mass percent Sodium hydroxide aqueous solution is carried out flocculation precipitation, after shaking up, place to produce precipita...
Embodiment 3
[0040] The first step is to extract the ammonium nitrogen test solution of the soil sample: Weigh 3g of the fresh soil sample and put it into a 100ml Erlenmeyer flask, add 25ml of NaCl aqueous solution with a mass percentage concentration of 20±0.5%, and shake it on the shaker at 170r / min Extract by shaking at a rate of 60 minutes to obtain the soil sample ammonium nitrogen test solution;
[0041] In the second step, centrifuge and transfer all the extracts to a 50ml polyethylene centrifuge tube, and perform centrifugation at 5000 rpm for 8 minutes;
[0042] The third step is to process the extract: transfer the supernatant to a test tube, add 0.5±0.005ml of zinc sulfate aqueous solution with a concentration of 10±0.5% by mass and 0.3ml of sodium hydroxide with a concentration of 25±0.5% by mass The aqueous solution is flocculated and precipitated. After shaking well, place it until precipitation occurs, filter it with a 5-3 glass sand core funnel with a pore size of 0.45 μm, ...
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