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yaya2008

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Titolo:
Spectrophotometric determination of boron in water effluents and fertilizers by sequential injection analysis

Autore:
van Staden, JF; van der Merwe, TA;
Indirizzi:
Univ Pretoria, Dept Chem, ZA-0002 Pretoria, South Africa Univ Pretoria Pretoria South Africa ZA-0002 -0002 Pretoria, South Africa

Titolo Testata:
SOUTH AFRICAN JOURNAL OF CHEMISTRY-SUID-AFRIKAANSE TYDSKRIF VIR CHEMIE
fascicolo: 2, volume: 53, anno: 2000,
pagine: 77 - 85
SICI:
0379-4350(200009)53:2<77:SDOBIW>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOILS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27

Recensione:
Indirizzi per estratti:
Indirizzo: van Staden, JF Univ Pretoria, Dept Chem, ZA-0002 Pretoria, South Africa Univ Pretoria Pretoria South Africa ZA-0002 South Africa

Citazione:
J.F. van Staden e T.A. van der Merwe, "Spectrophotometric determination of boron in water effluents and fertilizers by sequential injection analysis", S AFR J C-S, 53(2), 2000, pp. 77-85

--------------------------------------------------------------------------------

Abstract
A sequential injection system for the on-line monitoring of boron in watereffluents and fertilizer process streams is proposed. Azomethine-H, a condenisation product of saljcylaldehyde and H acid (8-amino-1-naphtol-3,6-disulphonic acid) is used as the chromogenic reagent. In solution the chromogenic reagent exists as two constituents. When boron is added to the solution. Azomethine H is formed and measured at 420 nm. The proposed system is fully computerised and is able to monitor boron at a rate of 28 samples per hour with a relative standard deviation less than 1.6%. The calibration curve is linear up to 100 mg l(-1). The system has a detection limit of 0.62 mg l(-1).
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