Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil

© 2015 Elsevier B.V. All rights reserved. A cost effective flow injection (FI) conductometric system has been developed for determination of total inorganic nitrogen (TIN). The system is aimed for evaluation of nitrogen nutrient in soil for agricultural application. Inorganic nitrogen compounds were...

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Main Authors: Pattama Yanu, Jaroon Jakmunee
Format: Journal
Published: 2018
Online Access:https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84935901459&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/47356
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-473562018-04-25T08:06:57Z Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil Pattama Yanu Jaroon Jakmunee © 2015 Elsevier B.V. All rights reserved. A cost effective flow injection (FI) conductometric system has been developed for determination of total inorganic nitrogen (TIN). The system is aimed for evaluation of nitrogen nutrient in soil for agricultural application. Inorganic nitrogen compounds were extracted from soil according to the standard method by using potassium chloride solution as an extractant, and the extracted solution was then injected into the FI system. Nitrate and nitrite are converted to ammonium ion by an in-line reduction column packed with a Devarda's alloy. A gas diffusion unit was incorporated into the FI system to separate ammonium ion from other ions in a donor stream by forming ammonia gas that can diffuse through a PTFE membrane to re-dissolve in an acceptor stream. Conductance of the acceptor stream was directly proportional to ammonium ion concentration. Various parameters affecting reduction efficiency of the column, e.g., column diameter, column packing procedure, and column length was investigated and optimized. A linear calibration graph in the range of 2.00-60.00 mg L < sup > -1 < /sup > N-NH < inf > 4 < /inf > < sup > + < /sup > (y=0.123x+0.039, R < sup > 2 < /sup > =0.997) was obtained with a limit of detection of 0.47 mg L < sup > -1 < /sup > . Sample throughput of 20 samples h < sup > -1 < /sup > was achieved. The result of developed method was correlated with total Kjeldahl nitrogen (TKN) obtained from the Kjeldahl digestion method. The proposed method could be used as an alternative method to the Kjeldahl method for determination of TIN in soil. 2018-04-25T08:06:57Z 2018-04-25T08:06:57Z 2015-06-19 Journal 00399140 2-s2.0-84935901459 10.1016/j.talanta.2015.06.002 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84935901459&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/47356
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
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description © 2015 Elsevier B.V. All rights reserved. A cost effective flow injection (FI) conductometric system has been developed for determination of total inorganic nitrogen (TIN). The system is aimed for evaluation of nitrogen nutrient in soil for agricultural application. Inorganic nitrogen compounds were extracted from soil according to the standard method by using potassium chloride solution as an extractant, and the extracted solution was then injected into the FI system. Nitrate and nitrite are converted to ammonium ion by an in-line reduction column packed with a Devarda's alloy. A gas diffusion unit was incorporated into the FI system to separate ammonium ion from other ions in a donor stream by forming ammonia gas that can diffuse through a PTFE membrane to re-dissolve in an acceptor stream. Conductance of the acceptor stream was directly proportional to ammonium ion concentration. Various parameters affecting reduction efficiency of the column, e.g., column diameter, column packing procedure, and column length was investigated and optimized. A linear calibration graph in the range of 2.00-60.00 mg L < sup > -1 < /sup > N-NH < inf > 4 < /inf > < sup > + < /sup > (y=0.123x+0.039, R < sup > 2 < /sup > =0.997) was obtained with a limit of detection of 0.47 mg L < sup > -1 < /sup > . Sample throughput of 20 samples h < sup > -1 < /sup > was achieved. The result of developed method was correlated with total Kjeldahl nitrogen (TKN) obtained from the Kjeldahl digestion method. The proposed method could be used as an alternative method to the Kjeldahl method for determination of TIN in soil.
format Journal
author Pattama Yanu
Jaroon Jakmunee
spellingShingle Pattama Yanu
Jaroon Jakmunee
Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil
author_facet Pattama Yanu
Jaroon Jakmunee
author_sort Pattama Yanu
title Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil
title_short Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil
title_full Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil
title_fullStr Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil
title_full_unstemmed Flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil
title_sort flow injection with in-line reduction column and conductometric detection for determination of total inorganic nitrogen in soil
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84935901459&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/47356
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