• Journal of Nutrition and Health
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• 제13권4호
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• pp.195-198
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• 1980

The contents of ascorbic acid in milk and fermented milk, yogurt added with fruits were determined by 2.6-dichlorophenol indophenol method using a Spectrophotometer. Threes sample of fruit milks and three of fruit yogurts were collected from the several markets in Busan City. The amounts of the vitamin as the reduced form were 0.16 mg/100m1 of strawberry milk, 0.31mg/100m1 of orange milk, and 0.08mg/100m1 of banana milk. The vitamin was not detected from the fermented fruit yogurt samples.

• 한국환경보건학회지
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• 제9권1호
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• pp.89-93
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• 1983

Various analytical methods for p-Nitrophenol derivatives have been reported as follows. 1) Thin-Layer Chromatography, 2) Gas Chromatography, 3) Cholinesterase Activity Determination, 4) Diazo Method, 5) Nitrophenol Method, 6) Indophenol Method. But these methods are mainly analyse total quantity of p-Nitrophenol and are not available for the seperation and pose some analytical problems associated with extensive clean up procedure. A rapid and simple method was developed for the seperation and quantitation for the p-Nitrophenol and it's derivatives by HPLC. Also an experiment was undertaken by the authors for the quantitation of the p-Nitrophenol in the blood of the intoxicated body. Levels of p-Nitrophenol ranging from approximately 0.10 to $1.69 \mu g/ml$ for Parathion and $3.44 \mu g/ml$ for EPN in each sample were measured with the average recovery of $95.5\pm0.52%$

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 2003년도 추계정기총회 및 국제심포지엄
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• pp.170-173
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• 2003

Activated Rice-Hull carbon was developed to remove ammonia compounds in water matrix. Isotherm adsorption tests of ammonia were conducted using a bottle-point technique and column test. Residual ammonia after Jar-Test or passing through the column was determined by Indophenol method, and assessed the removal efficiency for ammonia of the adsorbent. As a result, the adsorption capacity for ammonia of activated racehull carbon was very larger than that of coconut shell carbon, because the rice hull carbon had the higher BET surface area of silicate. The activated racehull carbon is under the development as adsorbent to remove ammonia in drinking water and waste water.

• 한국습지학회지
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• 제16권2호
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• pp.275-280
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• 2014

수중 암모니아성 질소는 각종 수질오염을 일으키는 물질로서 관리대상이다. 인도페놀법을 변형한 발색대 길이 측정으로 암모니아성 질소를 분석하기 위한 기초 실험을 수행하였다. 1-naphthol을 발색제로 사용한 암모니아성 질소 분석에서 최대 흡광도는 720nm 부근의 파장대에서 관찰되었고, 적정 주입양은 $0.5-1.5m{\ell}$였다. 발색 반응은 신속히 진행되어 20분이 경과하여 전체 최고 흡광도의 80%으로 나타내었고, 발색 시약을 조제하는 과정에서 NaOH 농도는 1.5-2.5M 농도로 설정하였으며, 초기 pH는 영향을 미치지 않았다. 또한, $25^{\circ}C$의 온도에서는 발색대의 길이에 미치는 영향이 미미한 것으로 나타났다.

• 한국대기환경학회지
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• 제24권1호
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• pp.43-54
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• 2008

Management and control of ammonia at the sources and ambient largely depend on sampling and measurement techniques. Good sampling and measurement techniques provide high quality data. The main purpose of the study is compare the analytical characteristics of the Indolphenol method which is one of the standard method in Korea with automatic analyzers for continued measuring gaseous ammonia. For comparison with other analytical methods, the verification test was designed to evaluate performance parameters; linearity, absorption efficiency, reproducibility and repeatability test, accuracy, and response time test. $R^2$ of calibration curve using IPM and CLM was very high (value is 1.000), but for EcSM $R^2$ value was estimated to be lower than IPM and CLM (as 0.991). The RSD of the CLM ranged from 0.1 to 2.3% over the nine concentration levels measured, %Ds was 0.1 to 10.7%, and average RA over all the measurements was 3.3%. The RSD of IPM and EcSM was ranged from 1.0 to 8.1, 3.9 to 14.0 respectively, and average RA were 8.71, 4.9% respectively. Rise in response times of EcSM was estimated to be 1 minute. It is found to be more sensitive than response time (which ranged from 2 to 9 minute) of CLM. For ammonia concentration measured using the IPM and the CLM from the same ammonia source, linear regression of IPM versus CLM show a slope of 0.805, an intercept of 637 ppb, and $R^2$ of 0.868.

• 농업과학연구
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• 제48권4호
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• pp.787-796
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• 2021

Nitrogen (N) is the most important element during the process of plant growth, and the quality of crops varies depending on the amount of nitrogen present. Most of the nitrogen is used for plant growth, but approximately 10 - 20% of Nitrogen is carried away by the wind in the form of NH₃. This volatilized NH₃ reacts with various oxides in the atmosphere to generate secondary particulate matter. To address this, the present study attempts to reduce NH₃ occurring in the soil using biochar at a specific pH. Biochar was used as a treatment with 1% (w·w^-1) of the soil, and urea was applied at different levels of 160, 320, and 640 kg·N·ha^-1. NH₃ generated in the soil was collected using a dynamic column and analyzed using the indophenol blue method. NH₃ showed the maximum emission within 4 - 7 days after the fertilizer treatment, decreasing sharply afterward. NH₃ emission levels were reduced with the biochar treatment in all cases. Among them, the best reduction efficiency was found to be approximately 25% for the 320 kg·ha^-1 + pH 6.7 biochar treatment. Consequently, in order to reduce the amount of NH₃ generated in the soil, it is most effective to use pH 6.7 biochar and a standard amount (320 kg·N·ha^-1) of urea.

• 대한화학회지
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• 제26권1호
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• pp.36-42
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• 1982

대기중의 암모니아가스와 암모늄염의 필터포집법에 관하여 연구하였다. 표준가스 발생장치로 발생시킨 암모니아가스를 3% 붕산-25% 글리세린 혼합액이 스며든 유리섬유 필터에 포집하였다. pH조절법으로 발생시킨 암모니아가스와 대기중의 암모니아를 5회씩 포집하여 측정한 결과 포집효율은 각각 96.4${\pm}$ 2.15%와 97.4${\pm}$1.06%였다. 시판되는 유리섬유 필터 및 Polycarbonate 필터에 대하여 암모니아가스의 흡착 및 탈리현상을 검토한 결과 유리섬유 및 석영 섬유 필터에서는 암모니아가스의 흡착과 약간의 암모늄염이 탈리되었으나, Polycarbonate 필터는 대기중의 암모늄염을 포집하는데 적합한 것으로 판단되었다. 지름 47mm의 필터에 20l/min의 유량으로 60분동안 대기를 포집하여 인도페놀법에 의한 분광광도법으로 측정 할 경우, 측정가능한 암모니아가스의 최저농도는 0.83ppb (약 0.63$\mug$/$m^3$)이다. 이 방법은 종래의 용액포집법에 의한 분광광도 측정법에 비하여 감도가 20배나 높으므로 대기중의 암모니아 농도의 변화를 단시간(약 60분)내에 측정할 수 있다.

• 한국환경농학회지
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• 제41권4호
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• pp.230-235
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• 2022

BACKGROUND: Ammonia gas emitted from nitrogen fertilizers applied in agricultural land is an environmental pollutant that catalyzes the formation of fine particulate matter (PM2.5). A significant portion (12-18%) of nitrogen fertilizer input for crop cultivation is emitted to the atmosphere as ammonia gas, a loss form of nitrogen fertilizer in agricultural land. The widely practiced method for fertilizer use in agricultural fields involves spraying the fertilizers on the surface of farmlands and mixing those with the soils through such means as rotary work. To test the potential reduction of ammonia emission by nitrogen fertilizers from the soil surface, we have added N, P, and K at 2 g each to the glass greenhouse soil, and the ammonia emission was analyzed. METHODS AND RESULTS: The treatment consisted of non-fertilization, surface spray (conventional fertilization), and soil depth spray at 10, 15, 20, 25, and 30 cm. Ammonia was collected using a self-manufactured vertical wind tunnel chamber, and it was quantified by the indophenol-blue method. As a result of analyzing ammonia emission after fertilizer treatments by soil depth, ammonia was emitted by the surface spray treatment immediately after spraying the fertilizer in the paddy soil, with no ammonia emission occurring at a soil depth of 10 cm to 30 cm. In the upland soil, ammonia was emitted by the surface spray treatment after 2 days of treatment, and there was no ammonia emission at a soil depth of 15 cm to 30 cm. Lettuce and Chinese cabbage treated with fertilizer at depths of 20 cm and 30 cm showed increases of fresh weight and nutrient and potassium contents. CONCLUSION(S): In conclusion, rather than the current fertilization method of spraying and mixing the fertilizers on the soil surface, deep placement of the nitrogen fertilizer in the soil at 10 cm or more in paddy fields and 15 cm or more in upland fields was considered as a better fertilization method to reduce ammonia emission.