Determination of asulam by fast stopped-flow chemiluminescence inhibition of luminol/peroxidase.
Talanta
; 77(1): 294-7, 2008 Oct 19.
Article
en En
| MEDLINE
| ID: mdl-18804636
ABSTRACT
An efficient, sensitive and fast stopped-flow method has been developed to determine asulam in water, based on its inhibition effect on the horseradish peroxidase-luminol-hydrogen peroxide chemiluminescence reaction, (HRP-luminol-H(2)O(2)). Ultra fast data acquisition (0.20s) facilitates excellent selectivity because no interferences from concomitants in the matrix act in such short time scale. The precision as repeatability (expressed as relative standard deviation, n=10) was 0.4% at a 40 pM level. The detection limit was 1.5 pM (0.35 ng/L) and 7.15 pM in pure and raw water, respectively. The calibration data over the range 5-60 pM present a correlation coefficient of r=0.9993. The proposed method has been applied to determine asulam in water samples by using solid-phase extraction (SPE). Mean recovery value was 98.1+/-2% at 50 pM level.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Carbamatos
/
Peroxidasa de Rábano Silvestre
/
Mediciones Luminiscentes
/
Luminol
Idioma:
En
Revista:
Talanta
Año:
2008
Tipo del documento:
Article