CPA residue levels in consecutive C48 cases of Oriental tobacco
Crop protection agents (CPA) can be applied to tobacco at various stages of the production cycle and if CPA residues are present in the product, they can be topic of concern. After tobacco is processed it is normally packed into cases or bales for shipment. This stage is a common point where CPA residue samples are collected and sent to a laboratory for analysis. The objective of this study was to test multiple positions within the case of tobacco to determine if the CPA residue levels were homogenous throughout the case. Three consecutive cases from a production run were tested to see if the CPA residue levels varied between cases. Twenty samples were taken from each of the three cases and tested in triplicate for common CPA residues found in that region. A previous study which sampled only one case revealed that pendimethalin was only found in two of the twenty samples taken from the case while all the other detected residues were consistently found in all twenty samples. A better understanding of CPA residue variances within and across cases may lead to more informed decisions about tobacco lot acceptability.