Devarda’s alloy 첨가가 축산분뇨 액비의 총 질소 및 무기태 질소 정량에 미치는 영향 (Effects of Devarda’s Alloy Addition on Determination of Total Nitrogen and Inorganic Nitrogen in Liquid Livestock Manure)

서지정보

· 발행기관 : 한국토양비료학회
· 수록지 정보 : 한국토양비료학회지(Korean Journal of Soil Science and Fertilizer) / 45권 / 2호 / 223 ~ 226페이지
· 저자명 : 임태준, 김기인, 박진면, 이성은, 노재승, 홍순달

초록

Liquid livestock manure (LLM) has been used as a nitrogen fertilizer source for horticulture plants. LLM contains organic nitrogen (N), ammonium, nitrate, and nitrite. The amount of nitrate and nitrite in LLM are usually small compared to the amount of ammonium in it and so they can be negligible if total nitrogen (N) concentration in LLM is higher than 1,000 mg L-1. However, if total N concentration in LLM is less than 1,000 mg L-1, the amount of nitrate and nitrite may affect total N concentration in LLM.
Currently, Kjeldahl digestion method is mainly used for ammonium-N in LLM. Therefore, it is ineffective to analyze nitrate-N and nitrite-N. The objective of this study was to evaluate whether the total N concentrations are affected by the amount of nitrate-N and nitrite-N with diverse LLMs by Kjeldahl method (with and without Devarda’s alloy after Conc. sulfuric acid digestion). Five liquid livestock manure samples were collected at swine farms in Ansung and Icheon. All LLM samples were stored at 25℃, subsampled at every 15th day for 90 days, and analyzed for total N, ammonium-N, and nitrate-N.
At the 90th day, LLM samples were analyzed with and without Devarda’s alloy after Conc. sulfuric acid digestion. Potassium nitrate, ammonium nitrate, and ammonium chloride were used to determine the N recovery percentages. Total N concentration ranged from 560 to 4,230 mg L-1. Nitrate-Ns were found in all LLM samples, ranged from 21 to 164 mg L-1. N recovery percentages with potassium nitrate were 0 %without Devarda’s alloy and 100% with Devarda’s alloy because adding Devarda’s alloy facilitated nitrate-N into ammonium-N conversion. Total Ns were significantly different between two methods,with and without Devarda’s alloy. Total N concentrations were 210 mg L-1 at LLM 4 and 370 mg L-1 at LLM 5 without Devarda’s alloy and 290 mg L-1 at LLM 4 and 490 mg L-1 at LLM 5 with Devarda’s alloy.
These results suggest that if total N of LLM is less 1,000 mg L-1, additional procedure such as adding Devarda’s alloy can be used to estimate the total N and inorganic N better.

영어초록

Liquid livestock manure (LLM) has been used as a nitrogen fertilizer source for horticulture plants. LLM contains organic nitrogen (N), ammonium, nitrate, and nitrite. The amount of nitrate and nitrite in LLM are usually small compared to the amount of ammonium in it and so they can be negligible if total nitrogen (N) concentration in LLM is higher than 1,000 mg L-1. However, if total N concentration in LLM is less than 1,000 mg L-1, the amount of nitrate and nitrite may affect total N concentration in LLM.
Currently, Kjeldahl digestion method is mainly used for ammonium-N in LLM. Therefore, it is ineffective to analyze nitrate-N and nitrite-N. The objective of this study was to evaluate whether the total N concentrations are affected by the amount of nitrate-N and nitrite-N with diverse LLMs by Kjeldahl method (with and without Devarda’s alloy after Conc. sulfuric acid digestion). Five liquid livestock manure samples were collected at swine farms in Ansung and Icheon. All LLM samples were stored at 25℃, subsampled at every 15th day for 90 days, and analyzed for total N, ammonium-N, and nitrate-N.
At the 90th day, LLM samples were analyzed with and without Devarda’s alloy after Conc. sulfuric acid digestion. Potassium nitrate, ammonium nitrate, and ammonium chloride were used to determine the N recovery percentages. Total N concentration ranged from 560 to 4,230 mg L-1. Nitrate-Ns were found in all LLM samples, ranged from 21 to 164 mg L-1. N recovery percentages with potassium nitrate were 0 %without Devarda’s alloy and 100% with Devarda’s alloy because adding Devarda’s alloy facilitated nitrate-N into ammonium-N conversion. Total Ns were significantly different between two methods,with and without Devarda’s alloy. Total N concentrations were 210 mg L-1 at LLM 4 and 370 mg L-1 at LLM 5 without Devarda’s alloy and 290 mg L-1 at LLM 4 and 490 mg L-1 at LLM 5 with Devarda’s alloy.
These results suggest that if total N of LLM is less 1,000 mg L-1, additional procedure such as adding Devarda’s alloy can be used to estimate the total N and inorganic N better.

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