Abraxis Test Method 500061

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Method Name:
Metolachlor by Immunoassay, Magnetic Particle. Official Name: Abraxis Metolachlor Assay Kit (100T) PN 500061

Metolachlor is detected using a colorimetric immunoassay (ELISA) procedure. A sample (0.20 mL) and an enzyme conjugate (enzyme-labeled Metolachlor) are added to a disposable test tube followed by the addition of paramagnetic particles attached with Metolachlor-specific antibodies. Both the Metolachlor in the sample and the enzyme conjugate compete for antibody binding sites on the paramagnetic particles in proportion to their concentrations. At the end of an incubation period, the magnetic particles are separated and washed with the aid of a magnetic separator. A substrate is then added which is catalyzed by the enzyme and converted from a colorless to a blue solution. The reaction is terminated with the addition of a dilute acid. The concentration of Metolachlor in the sample is determined by measuring its absorbance at a specific wavelength (450 nm) using a photometer and comparing its absorbance to the absorbance of the calibrators.

This method determines Metolachlor in water (groundwater, surface water, well water).

Abraxis User Guides and Flowcharts

Cross-reactivity: High concentrations of Acetochlor may produce false positive responses for Metolachlor.

QC Requirements:
(A) Calibration with 3 standards and 1 blank, all analyzed in duplicate.(B) Precision: 3 matrix samples with different levels in the range for quantitative analysis analyzed daily for 5 days with 5 replicates in each of 5 assays.(C) Accuracy: 5 matrix samples spiked with the target analyte at 6 different levels in the range for quantitative analysis.(D) Validation: Analysis of 4 positive and 4 negative samples by an independent method for confirmation.

Maximum Holding Time:
14 days at 4oC, longer if held frozen



0.07 - 5.0



Revision Number:

Analytical testing dots

Related Methods:
Test Method 500001    Test Method 500007    Test Method 500021    Test Method 500061    Test Method 500071    Test Method 500076    Test Method 500081    Test Method 500086    Test Method 500090    Test Method 500201   

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Analytical testing dots