Sequential Injection Titration with Spectrophotometric Detection for the Assay of Acidity in Fruit Juices
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Accession number;06A0028784
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| Title;Sequential Injection Titration with Spectrophotometric Detection for the Assay of Acidity in Fruit Juices |
| Author;
JAKMUNEE JAROON
(Chiang Mai Univ., Chiang Mai, Tha)
RUJIRALAI THITIMA
(Chiang Mai Univ., Chiang Mai, Tha)
GRUDPAN KATE
(Chiang Mai Univ., Chiang Mai, Tha)
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Journal Title;Anal Sci
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Journal Code:G0673B
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ISSN:0910-6340
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VOL.22;NO.1;PAGE.157-160(2006)
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| Figure&Table&Reference;FIG.5, TBL.3, REF.16 |
| Pub. Country;Japan |
| Language;English |
| Abstract;A simple sequential injection analysis (SIA) with spectrophotometric detection for an assay of acidity in fruit juice was investigated. An alkaline reagent (sodium hydroxide), a sample and an indicator (phenolphthalein) were first aspirated and stacked as adjacent zones in a holding coil. With flow reversal through a reaction coil to the detector, zone penetration occurred, leading to a neutralization reaction that caused a decrease in the color intensity of the indicator being monitored for absorbance at 552 nm. The effects of various parameters were studied. Linear calibration graphs for acidities of 0.2-1.0 and 0.5-2.5% w/v citric acid as a standard, with a relative standard deviation of 1% (acidity of 0.3-0.6% w/v as citric acid, n = 11) and a sample throughput of 30 samples h'-1', were achieved. The developed method was validated by a standard titrimetric method for assaying the acidity of fruit juice samples. (author abst.) |
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