start-ver=1.4
cd-journal=joma
no-vol=18
cd-vols=
no-issue=10
article-no=
start-page=1121
end-page=1125
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=20021010
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Sensitivity Improvement of Ammonia Determination Based on Flow-Injection Indophenol Spectrophotometry with Manganese(II) Ion as a Catalyst and Analysis of Exhaust Gas of Thermal Power Plant
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The sensitivity improvement of a flow-injection spectrophotometric method for the determination of ammonia was examined based on an indophenol blue coloration reaction with salicylate and hypochlorite in the presence of manganese(II) as a reaction promotion catalyst. The optimal conditions for achieving higher sensitivity of ammonia determination were examined using a three-line flow system. The limit of detection corresponding to a signal-to-noise ratio (S/N) of 3 was 0.005 mg l(-1) (≡ 5 ppb) of NH(4)(+). A calibration graph was linear in the range from 5 ppb to 1000 ppb of ammonium ion. The relative standard deviations (n=9) for 50 ppb and 100 ppb of ammonium ion were 6.4% and 2.2%, respectively. The proposed method was applied to the determination of ammonia in the exhaust gas of a thermal power plant. Prior to the FIA determination, ammonia in the exhaust gas was absorbed into a boric acid solution; the absorption solution was then analyzed by the proposed FIA.
en-copyright=
kn-copyright=

en-aut-name=TsuboiTomonori
en-aut-sei=Tsuboi
en-aut-mei=Tomonori
kn-aut-name=坪井知則
kn-aut-sei=坪井
kn-aut-mei=知則
aut-affil-num=1
ORCID=

en-aut-name=HiranoYoshio
en-aut-sei=Hirano
en-aut-mei=Yoshio
kn-aut-name=平野義男
kn-aut-sei=平野
kn-aut-mei=義男
aut-affil-num=2
ORCID=

en-aut-name=ShibataYoshinori
en-aut-sei=Shibata
en-aut-mei=Yoshinori
kn-aut-name=柴田佳典
kn-aut-sei=柴田
kn-aut-mei=佳典
aut-affil-num=3
ORCID=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=本水昌二
kn-aut-sei=本水
kn-aut-mei=昌二
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=The Chugoku Electric Power Co., Inc. Technical Research Center

affil-num=2
en-affil=
kn-affil=The Chugoku Electric Power Co., Inc. Technical Research Center

affil-num=3
en-affil=
kn-affil=Chuden Kankyo Technos Co., Ltd.

affil-num=4
en-affil=
kn-affil=岡山大学
END

start-ver=1.4
cd-journal=joma
no-vol=45
cd-vols=
no-issue=11
article-no=
start-page=993
end-page=998
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1996
dt-pub=19961105
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Flow injection analysis for spectrophotometric determination of trace amounts of hydrazine in boiler feed water
kn-title=フローインジェクション分析法によるボイラ給水中の微量ヒドラジンの吸光光度定量
en-subtitle=
kn-subtitle=
en-abstract=火力発電所のボイラ給水中に脱酸素剤として添加され,酸素と反応後残留している微量ヒドラジンのフローインジェクション-吸光光度定量について,p-ジメチルアミノベンズアルデヒド(DMBA)を用いて検討を行った.DMBAを用いる従来のバッチ式マニュアル分析法では,DMBAの溶解に塩酸と多量のアルコールを用いているが,試薬液調製の簡便化,取り扱いの容易さ,廃液処理の容易さから,アルコールを全く用いない反応系の開発について検討した.その結果,水と塩酸で調製した反応試薬液を用いても,従来法の反応試薬液と比較すると若干感度は劣るが十分定量に使用できることが分かった.FIAへの適用の詳細な検討の結果,検量線は0~100ppbの範囲で良好な直線性が得られた.S/N=3に相当する検出限界は0.2ppbであり,5ppbのヒドラジン試料に対する相対標準偏差は1.1%であった.本FIAは,共存金属イオンの影響もなく,微量ヒドラジンのボイラ給水管理分析に適用可能であることが分かった.
kn-abstract=Trace amounts of hydrazine in boiler feed water were determined by a flow injectionspectrophotometric method with p-dimethylaminobenzaldehyde (DMBA). The DMBA solution for the color development was prepared by dissolving it in diluted hydrochloric acid without using any organic solvents such as alcohols. The reagent solution proposed in this work had several advantages, compared with the alcoholic solution usually used in the batchwise spectrophotometric method. The solution was easily prepared with hydrochloric acid and water, stable for longer times and did not evolve when the solution was mixed with sample solutions, and the waste treatment was easier than for the alcoholic solution. A carrier (H(2)O)and the reagent solution were propelled at flow rates of 1.0 ml min(-1) and 0.6 ml min(-1), respectively. They were merged to flow into a reaction coil (0.6 mm i.d.×6 m) kept in a temperature-controlled air bath at 80℃.Samples were injected into the carrier stream, and the reaction product was measured at 458 nm. Metal ions and ammonia did not interfere with the determination of hydrazine. The calibration graph was linear up to 100 ppb of hydrazine, and the detection limit corresponding to a signal to noise ratio of 3 was 0.2 ppb.Relative standard deviations for seven replicates of 5, 50 and 100 ppb of hydrazine were 1.1, 0.9 and 0.4%, respectively. The proposed method was applied to the determination of hydrazine in boiler feed water samples.
en-copyright=
kn-copyright=

en-aut-name=TsuboiTomonori
en-aut-sei=Tsuboi
en-aut-mei=Tomonori
kn-aut-name=坪井知則
kn-aut-sei=坪井
kn-aut-mei=知則
aut-affil-num=1
ORCID=

en-aut-name=NakamuraTakahiro
en-aut-sei=Nakamura
en-aut-mei=Takahiro
kn-aut-name=中村孝洋
kn-aut-sei=中村
kn-aut-mei=孝洋
aut-affil-num=2
ORCID=

en-aut-name=MatsukuraAkiko
en-aut-sei=Matsukura
en-aut-mei=Akiko
kn-aut-name=松倉亜希子
kn-aut-sei=松倉
kn-aut-mei=亜希子
aut-affil-num=3
ORCID=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=本水昌二
kn-aut-sei=本水
kn-aut-mei=昌二
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=中国電力(株)技術研究センター

affil-num=2
en-affil=
kn-affil=中国電力(株)技術研究センター

affil-num=3
en-affil=
kn-affil=中電環境テクノス(株)

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=hydrazine
kn-keyword=hydrazine
en-keyword=boiler feed water
kn-keyword=boiler feed water
en-keyword=FIA
kn-keyword=FIA
en-keyword=spectrophotometry
kn-keyword=spectrophotometry
en-keyword=p-dimethylami-nobenzaldehyde
kn-keyword=p-dimethylami-nobenzaldehyde
END

start-ver=1.4
cd-journal=joma
no-vol=48
cd-vols=
no-issue=2
article-no=
start-page=253
end-page=259
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1999
dt-pub=19990205
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Development of a new gas-permeation system and its application to the spectrophotometric determination of ammonium ion by FIA
kn-title=精密分析用ガス透過システムの設計とガス透過/フローインジェクション法によるアンモニア態窒素の吸光光度定量
en-subtitle=
kn-subtitle=
en-abstract=ガス透過分離におけるガス透過の長期間の安定性と高効率化,更にガス透過効率の長期間の再現性を向上させた,新しいオンラインガス透過システムを構築した.このシステムでは新しく設計・製作したガス透過ユニットを組み込み,ユニット中を溶液が下方から上方に流れるようにし,気泡の発生を防ぐ工夫がほどこされ,更に測定後にガス透過ユニット内に滞留する溶液を排除するために2個の六方切り替えバルブを内蔵させている.ガスの安定的透過のために温度制御できる小型恒温槽を装着した.この装置中にガス透過ユニット,アンモニウムイオン定量用の反応コイルなどを組み入れ,精密測定の向上を目指した.ガス透過ユニットは,多孔質ポリテトラフルオロエチレン(PTFE)チューブとガラス管からなり,接続には樹脂製フェラル及びO-リングを用い,組み立てを容易にし,デッドボリュームも小さくした.ガス透過ユニット,反応コイル及び試料注入器などを恒温槽の中で一定温度に保つことにより,安定した再現性の良い測定が可能となった.ガス透過ユニット内に滞留する溶液を簡単かつ迅速に強制排除する機能も備えており,測定後はガス透過ユニット中の溶液を除いておくことにより,多孔質チューブの透過性能が長期間維持され,再活性化の操作をすることなく,高いガス透過効率を維持することができた.本システムを用いると,検量線は0〜10,0〜1.0ppmの範囲で良好な直線性を示し,1時間当たり30試料の分析が可能となった.実際に,河川水中のアンモニウムイオンの定量を行ったところ,インドフェノール誘導体/FIA/吸光光度法による定量値と良く一致し,試料に対する相対標準偏差は0.51,0.83%で,回収率は97〜98%と良好であった.
kn-abstract=A new on-line gas-permeation system was developed to enhance the efficiency and stability of gas permeation for a long time, and was applied to the determination of ammonium ion in river-water samples by the flow- injection method. The proposed gas-permeation system consists of a newly designed gas-permeation unit, a sample injection valve, a reaction coil and two six-way rotary valves in a constant-temperature oven. The gas- permeation unit was assembled using an inner micro porous polytetrafluoroethylene (PTFE) membrane tubing and an outer glass tube, which could be easily connected with one another using connectors with ferrules and o-rings. A sample solution was injected into a carrier containing 0.02 M sodium hydroxide, in which ammonium ion was converted to gaseous ammonia. The gaseous ammonia generated in the carrier passed through the micro porous PTFE membrane, was absorbed in a reagent solution and changed the pH of the reagent solution, which resulted in a color change to cresol red. The absorbance change of cresol red at 550 nm was measured using a visible detector with a flow cell (8μl, 10mm path). After the measurement, two six-way rotary valves were switched over from the flowing state to the drain state of the gas-permeation unit, and the residual solutions in the gas-permeation unit were removed and the PTFE membrane tubing was dried. By keeping the temperature of the oven at 40℃, the sensitivity and the reproducibility for the determination of ammonium ion was improved. Furthermore, the efficiency of gas permeation through the inner tubing could be kept high and constant for a long period without any procedure for reactivating the porous PTFE membrane tubing. Calibration graphs for ammonium ion were liner over ranges of 0 to 10 ppm and 0 to 1.0 ppm of N-NH(4)(+), and the sampling rate was 30 samples per hour. The detection limit for N-NH(4)(+) was about 0.01 ppm when the effective length of the membrane tubing was 5 cm. By using the proposed FIA system, ammonium ion in river-water samples was determined. The analytical results obtained by the proposed method showed a good correlation with those obtained using the indophenol derivatization/FIA method. The relative standard deviations of ten injections were 0.51% and 0.83% with concentrations of 2.73 ppm and 4.11 ppm, respectively. The recoveries of ammonium ion were found to be 97〜98%.
en-copyright=
kn-copyright=

en-aut-name=HiguchiKeiro
en-aut-sei=Higuchi
en-aut-mei=Keiro
kn-aut-name=樋口慶郎
kn-aut-sei=樋口
kn-aut-mei=慶郎
aut-affil-num=1
ORCID=

en-aut-name=InoueAkiko
en-aut-sei=Inoue
en-aut-mei=Akiko
kn-aut-name=井上亜希子
kn-aut-sei=井上
kn-aut-mei=亜希子
aut-affil-num=2
ORCID=

en-aut-name=TsuboiTomonori
en-aut-sei=Tsuboi
en-aut-mei=Tomonori
kn-aut-name=坪井知則
kn-aut-sei=坪井
kn-aut-mei=知則
aut-affil-num=3
ORCID=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=本水昌二
kn-aut-sei=本水
kn-aut-mei=昌二
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=東京化成工業(株)FIA研究グループ

affil-num=3
en-affil=
kn-affil=中国電力(株)技術研究センター

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=gas permeation system
kn-keyword=gas permeation system
en-keyword=microporous polytetrafluoroethylene membrane tubing
kn-keyword=microporous polytetrafluoroethylene membrane tubing
en-keyword=FIA with gas permeation method
kn-keyword=FIA with gas permeation method
en-keyword=determination of ammonium ion
kn-keyword=determination of ammonium ion
en-keyword=river water sample
kn-keyword=river water sample
END

start-ver=1.4
cd-journal=joma
no-vol=51
cd-vols=
no-issue=1
article-no=
start-page=47
end-page=51
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=20020105
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Sensitive determination of ammonia in exhaust gas of thermal power plant using gas permeation/flow injection system
kn-title=ガス拡散/フローインジェクション分析法による排ガス吸収液中の微量アンモニアの高感度定量
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A flow injection analysis coupled with a gas permeation unit for the sensitive determination of ammonia was investigated to improve the sensitivity and the rapidity of the determination of trace amounts of ammonia in exhaust gas. As gas sampling times are shortened, ammonium concentrations in absorption liquid (boric acid solution) will be lowered; the determination sensitivity of ammonia in the absorption liquid needs to be improved. Various experimental conditions, such as reagent solutions, sample sizes, reaction temperatures, flow rates of the reagent solutions and the length of gas permeation tube, were investigated and optimized. Of these, the reaction temperature and the length of gas permeation tube were found to greatly effect the sensitivity improvement for the determination of ammonia. The effect of the length of the microporous PTFE tube used for the gas permeation system was investigated by varying the length from 5 cm to 50 cm. The results showed that is the 50 cm tube, the peak height was about 6 times higher than in the 10 cm tube, and the percentage of the permeation of ammonia was about 55% and 9% in the 50 cm and 10 cm tube, respectively. Under the optimized conditions, the limit of detection of ammonia was lowered down to on fifth of the previous system. The limit of detection corresponding to the standard deviation of the reagent blank of 3 was 4 μg l(-1) of NH(4)(+). A calibration graph was linear from 10 μg l(-1) to 500 μg l(-1) of NH(4)(+). The relative standard deviations for 50 μg l(-1) and 100 μg l(-1) of NH(4)(+) were 4.5% and 2.3%, respectively. The proposed method was suitably applied to the determination of ammonia in the exhaust gas of the thermal power plant.
en-copyright=
kn-copyright=

en-aut-name=TsuboiTomonori
en-aut-sei=Tsuboi
en-aut-mei=Tomonori
kn-aut-name=坪井知則
kn-aut-sei=坪井
kn-aut-mei=知則
aut-affil-num=1
ORCID=

en-aut-name=HiranoYoshio
en-aut-sei=Hirano
en-aut-mei=Yoshio
kn-aut-name=平野義男
kn-aut-sei=平野
kn-aut-mei=義男
aut-affil-num=2
ORCID=

en-aut-name=ShibataYoshinori
en-aut-sei=Shibata
en-aut-mei=Yoshinori
kn-aut-name=柴田佳典
kn-aut-sei=柴田
kn-aut-mei=佳典
aut-affil-num=3
ORCID=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=本水昌二
kn-aut-sei=本水
kn-aut-mei=昌二
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=中国電力 (株) 技術研究センター

affil-num=2
en-affil=
kn-affil=中国電力 (株) 技術研究センター

affil-num=3
en-affil=
kn-affil=中電環境テクノス (株)

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=gas permeation system
kn-keyword=gas permeation system
en-keyword=ammonia
kn-keyword=ammonia
en-keyword=exhaust gas of a thermal power plant
kn-keyword=exhaust gas of a thermal power plant
en-keyword=FIA
kn-keyword=FIA
END

start-ver=1.4
cd-journal=joma
no-vol=53
cd-vols=
no-issue=4
article-no=
start-page=309
end-page=314
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2004
dt-pub=20040914
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Rapid and simple determination of chemical oxygen demand (COD) with potassium permanganate as an oxidizing agent by a flow-injection technique using a platinum-tube reactor
kn-title=白金チューブを反応管として用いる過マンガン酸カリウム酸化/フローインジェクション分析法による化学的酸素要求量の迅速定量
en-subtitle=
kn-subtitle=
en-abstract=化学的酸素要求量（COD）の迅速定量についてフローインジェクション/吸光光度定量の検討を行った．過マンガン酸カリウムを酸化剤として用い，この酸化反応の反応時間を促進させ，短縮するため触媒を用いる方法について検討した．その結果，白金チューブを反応コイルとして用いることにより，酸化反応が促進され測定時間を大幅に短縮できることが分かった．白金チューブ反応コイルのフローインジェクション分析（FIA）法への適用について詳細な検討を行った結果，D-グルコースを標準物質としたとき，検量線は0〜100 ppmの範囲で良好な直線性を示した．S/N＝3に相当する検出限界は0.01 ppmであり，5，10，20，50，100 ppmのD-グルコースに対する相対標準偏差は，それぞれ0.9，0.8，0.8，0.5，1.4％であった．本FIA法は，排水のCOD迅速定量に適用可能であり，またCODモニターとして利用できる．
kn-abstract=A rapid and simple spectrophotometric determination method for chemical oxygen demand in water samples was developed using a flow-injection method. The detection method is based on the permanganate oxidation reaction accelerated by a catalyst. A platinum tube reactor was installed after the merging point of a carrier and a reagent stream as a catalyst and a reactor coil, and was heated at 95°C by an aluminum heating block. By using the platinum tube reactor (0.5 mm i.d.×3 m), a standard sample, D-glucose, was measured within a few minutes, and the calibration graph was linear from 0 to 100 ppm of COD(D-glucose); the detection limit corresponding to S/N = 3 was 0.01 ppm. The relative standard deviations for 5, 10, 50 and 100 ppm of COD(D-glucose) were 0.9, 0.8, 0.8, 0.5 and 1.4%, respectively. The proposed FIA system can be applied to waste water or can be used as a monitor of COD.
en-copyright=
kn-copyright=

en-aut-name=TsuboiTomonori
en-aut-sei=Tsuboi
en-aut-mei=Tomonori
kn-aut-name=坪井知則
kn-aut-sei=坪井
kn-aut-mei=知則
aut-affil-num=1
ORCID=

en-aut-name=HiranoYoshio
en-aut-sei=Hirano
en-aut-mei=Yoshio
kn-aut-name=平野義男
kn-aut-sei=平野
kn-aut-mei=義男
aut-affil-num=2
ORCID=

en-aut-name=KinoshitaKazuyoshi
en-aut-sei=Kinoshita
en-aut-mei=Kazuyoshi
kn-aut-name=木下一次
kn-aut-sei=木下
kn-aut-mei=一次
aut-affil-num=3
ORCID=

en-aut-name=OshimaMitsuko
en-aut-sei=Oshima
en-aut-mei=Mitsuko
kn-aut-name=大島光子
kn-aut-sei=大島
kn-aut-mei=光子
aut-affil-num=4
ORCID=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=本水昌二
kn-aut-sei=本水
kn-aut-mei=昌二
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=中国電力株式会社技術研究センター

affil-num=2
en-affil=
kn-affil=中国電力株式会社技術研究センター

affil-num=3
en-affil=
kn-affil=岡山大学理学部

affil-num=4
en-affil=
kn-affil=岡山大学理学部

affil-num=5
en-affil=
kn-affil=岡山大学理学部
en-keyword=chemical oxygen demand
kn-keyword=chemical oxygen demand
en-keyword=FIA
kn-keyword=FIA
en-keyword=spectrophotometry
kn-keyword=spectrophotometry
en-keyword=platinum catalyst
kn-keyword=platinum catalyst
en-keyword=potassium permanganate
kn-keyword=potassium permanganate
en-keyword=waste water
kn-keyword=waste water
END