An internal standard solution of endrin (0.03lg/ml) and bromophos (0.2lg/ml) was also prepared and added to all pesticide standard mixed solutions, and to all extracts in the final step before gas chromatograph (GC) analysis.
An internalstandard solution of endrin (0.03lg/ml) and bromophos(0.2lg/ml) was also prepared and added to all pesticidestandard mixed solutions, and to all extracts in the finalstep before gas chromatograph (GC) analysis.