Correction of iron interface in the spectrophotometric flow injection catalytic determination of molybdenum in plants.
Talanta
; 42(12): 2021-6, 1995 Dec.
Article
in En
| MEDLINE
| ID: mdl-18966446
ABSTRACT
Iron interference in the spectrophotometric catalytic determination of molybdenum based on the iodide-hydrogen peroxide reaction can be corrected by using sulphosalicylic acid as masking and color-forming reagent. The catalytic influence of iron ions is circumvented to the extent of about 90% and correction of any remaining iron ions is possible by monitoring the colored iron(III)-salicylate complex at 490 nm. In this way, iron is also determined. With the proposed system, molybdenum can be determined in plant and food digests within the 0-100 mug Mo 1(-1) range in the presence of up to 25 mg Fe 1(-1), at a sampling rate of about 50 determinations h(-1). The relative standard deviation of 10 consecutive measurements was estimated as < 2%. Results for samples were comparable with those obtained by graphite furnace atomic absorption spectrometry. In addition, recoveries within the range 94-100% were calculated.
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Talanta
Year:
1995
Document type:
Article
Affiliation country:
Brazil