Comparison of three colorimetric methods for the determination of manganese in freshwaters

Chiswell B. and O'Halloran K.R. (1991) Comparison of three colorimetric methods for the determination of manganese in freshwaters. Talanta, 38 6: 641-647. doi:10.1016/0039-9140(91)80149-T


Author Chiswell B.
O'Halloran K.R.
Title Comparison of three colorimetric methods for the determination of manganese in freshwaters
Journal name Talanta   Check publisher's open access policy
ISSN 0039-9140
Publication date 1991-01-01
Sub-type Article (original research)
DOI 10.1016/0039-9140(91)80149-T
Volume 38
Issue 6
Start page 641
End page 647
Total pages 7
Subject 1602 Criminology
1607 Social Work
Abstract Three calorimetric methods for the determination of manganese in freshwaters have been investigated and compared with the atomic-absorption spectrometry (AAS) method. Two of the methods, viz. the formaldoxime (FAD) and pyridylazonaphthol (PAN) methods were found to yield poor calibration curves upon standardization, and to have high average errors for the estimation of manganese concentrations in standard solutions. The FAD method, when applied to freshwater samples, was found to be subject to an interfering UV absorbance which could not be negated successfully by a reagent blank; the method thus tended to give high estimations at low concentrations of manganese, but the results obtained also appear to be very sensitive to the nature of the freshwater matrix. On the other hand the PAN method was found to give very high estimations for the concentration of manganese, in both standard solutions and in freshwater samples, owing to the nature of the absorbance of the ligand used for manganese determination. This method also appears to be affected by the freshwater matrix, leading to gross overestimation of manganese levels. A third method, based on a porphyrin ligand [T-(4-CP)P], was found to give results comparable with those of the AAS method in estimating the soluble manganese content in freshwaters.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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