RaPID Assay Cyclodienes in soil application

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Intended Use

For detection of cyclodiene insecticides (as dieldrin) in soil. For testing in other matrices, please contact our technical support department at 1-800-544-8881.

Materials Required but Not Provided

SDI Sample Extraction Kit
(Part Number: A00256EA)

Procedural Notes and Precautions

  • Prepare soil samples for analysis according to the procedure in the SDI Sample Extraction Kit Users Guide.
  • After extraction and dilution of samples, follow the immunoassay procedure as described in the Rapid Assay  Cyclodienes Test Kit User’s Guide.
  • The initial 1.33x dilution described for water samples in Step 1 of “Collect/Store the Sample” does not need to be performed for soil samples.

Quality Control

A control solution at approximately 10 ppb (as dieldrin) is provided with the Cyclodienes RaPID Assay Kit. It is recommended that it be included in every run and treated in the same manner as unknown samples. If running standard soil procedures an acceptable result should be 100 times the value stated on the control vial (i.e. 1000 + or – 200 ppm) when the control results are corrected for the dilution factors (see Results section below).

Results Interpretation

Interpret soil sample results as described in the RaPID Assay Cyclodienes Test Kit procedure, accounting for the total dilution factor indicated in the table of the SDI Sample Extraction Kit Users Guide. Alternatively, program the RPA-1 Analyzer as listed below to automatically correct for this dilution factor.

1. The RPA-I photometer (provided in the Rapid Assay Accessory kit) can be used to calculate and store calibration curves. To obtain soil results from the Cyclodienes Rapid Assay test kit on the RPA-I the following parameter settings are recommended:

Data Reduct : Lin. Regression
Xformation : Ln/LogitB
Read Mode : Absorbance
Wavelength : 450 nm
Units : PPB
# Rgt Blk : 0

Calibrators:
# of Cals : 4
# of Reps : 2

Concentrations:
#1: 0.00 ppb
#2: 100 ppb
#3: 750 ppb
#4: 2000 ppb
Range: 100 - 2000
Correlation: 0.990
Rep. %CV: 10%

Performance Data

The Cyclodienes RaPID Assay does not differentiate between cyclodienes and other related compounds. The table below shows compounds at the method detection limit (MDL) which is the lowest concentration of the compound in soil that can be picked up in the assay. The limit of quantitation (LOQ) is an approximate concentration required to yield a positive result at the lowest standard, this is the lowest concentration of the compound in soil that can be quantified in the assay. The IC50 is the concentration in soil required to inhibit one half of the color produced by the negative control. It is also used to calculate cross-reactivity values to similar compounds.

Range of Detection

The Cyclodienes RaPID Assay has a range of detection in soil of 100 ppb to 2000 ppb (as dieldrin) when used in conjunction with the SDI Sample Extraction Kit.

Recovery

Cyclodienes recoveries will vary depending on soil type, retention mechanism, solvent and extraction apparatus used, length of extraction period and levels of potentially interfering substances in the soil.

 

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