This study developed an electrospray ionization (ESI) liquid chromatography/mass spectrometry (LC/MS) method for the analysis
of polar turfgrass pesticides that are commonly used in North America. The water
samples were first extracted by using a solid phase extraction (SPE) technique. The analysis was then carried
out with a Waters 2690 LC equipped with a ZMD detector. The separation was
performed on a reverse phase C18 column. Acetonitrile/5 mM ammonium acetate in
water were used as the solvents for the gradient mobile phase profile. The flowrate was
set to 0.25 mL/min. The injection volume was 20 uL.
This method was effectively used for the analysis of a number of turfgrass pesticides of
low volatility in finished drinking water, groundwater, and surface water. These
contaminants included bensulide, clopyralid, halofenozide, imidacloprid, mecoprop,
neburon, oryzalin, paclobutrazol, triadimefon, triadimenol, etc. Bisphenol A-d16 was
used as the internal standard. 4-(4'-bromophenyl)phenol was used as the surrogate.
The calibrations were in a range of 0.05-30 ug/L. The method detection limits (MDLs)
were determined by measuring seven replicate laboratory fortified blanks spiked at the
method reporting level (MRL) at 0.5 ug/L or less. The MDLs were calculated as a
product of the standard deviation of the replicate analyses and the student's t value with
a 99% confidence level and a n-1 degree of freedom. The method accuracy (mean
recovery) and precision (relative standard deviation, RSD) were determined by
measuring four replicate laboratory fortified blanks (LFBs) spiked at 5-10 ug/L. Includes 9 references, tables.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 290 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 3 |
| Published : | 11/02/2003 |
