Full TGIF Record # 80990
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Web URL(s):http://www.tandfonline.com/doi/pdf/10.1081/PLN-120004382
    Last checked: 10/13/2015
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Publication Type:
i
Report
Author(s):Cruz, C.; Martins Loução, M. A.
Author Affiliation:Departamento de Biologia Vegetal, Faculdade de Ciências de Lisboa, Lisboa, Portugal
Title:Comparison of methodologies for nitrate determination in plants and soils
Source:Journal of Plant Nutrition. Vol. 25, No. 6, June 2002, p. 1185-1211.
# of Pages:26
Publishing Information:New York: Marcel Dekker, Inc.
Keywords:TIC Keywords: Nitrates; Cadmium; Measurement; Chromatography; Organic matter; Activated charcoal; Filters; Chemical properties of soil; Chemical tests; Analytical methods; Comparisons
Abstract/Contents:"Several procedures have been described for the determination of nitrate by biological reduction, cadmium reduction, and salicylic acid electrophilic substitution. However, all are subject to interference by constituents of soil and plants. The aim of this work is to compare the results obtained using these methods with those obtained by ion chromatography. Because most of the interferences to which these methods are subject are due to organic matter, three pretreatments to reduce the presence of organic matter in the sample extracts were compared: 1 - adding activated charcoal; 2 - filtering through a 0.45 μm filter; and 3 - ultra-filtering through a 10 kDa membrane. A method and respective pretreatment were considered acceptable for measurement of nitrate in a particular soil or plant extract if: (i) nitrate added to the soil extraction used (without the soil or the plant material) was quantitatively recovered, and an acceptable reference curve could be established; (ii) between 95% and 105 % of the nitrate added to the sample was recovered; and (iii) replicates agreed within 10%. Method recommendation for future analysis was based on: 1 - simplicity; 2 - accuracy; 3 - interferences; 4 - equipment needed; and 5 - cost of analysis. Application of these criteria to the results indicated that the biological reduction of nitrate with nitrate reductese (NR) from E. coli is the most suitable method for nitrate determination in laboratories that are not equipped with an ion chromatograph."
Language:English
References:36
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cruz, C., and cão Martins Lou^D. 2002. Comparison of methodologies for nitrate determination in plants and soils. J. Plant Nutr. 25(6):p. 1185-1211.
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Web URL(s):
http://www.tandfonline.com/doi/pdf/10.1081/PLN-120004382
    Last checked: 10/13/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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