Extraction and colorimetric determination of nitrilotriacetate (NTA) in soils

1 January 1972

journal article
research article
Published by Taylor & Francis in Communications in Soil Science and Plant Analysis

Vol. 3 (1) , 57-64
https://doi.org/10.1080/00103627209366350

Abstract

A simple colorimetric method of determining nitrilotriacetate (NTA) in soils is described. The soil sample is extracted by treatments with 0.025M NaOH and CaCl₂ solution, and the extract is analyzed for NTA by measurement of the absorbance at 620 tun of the blue color obtained when an aliquot is treated with borate buffer (pH 9.2), zinc sulfate, and 2‐carboxy‐2'‐hydroxy‐5'‐sulfoformazylbenzene (Zincon) after removal of interfering cations by a resin treatment (Na⁺ Dowex 50). The method gives quantitative recovery of NTA added to soils.

Keywords

This publication has 3 references indexed in Scilit:

Phosphate Replacements: Problems with the Washday Miracle
Science, 1971
Arylsulfatase Activity of Soils
Soil Science Society of America Journal, 1970
Colorimetric Determination of Zinc and Copper with 2-Carboxy-2´-hydroxy-5´-sulfoformazylbenzene
Analytical Chemistry, 1954