PROGRESS OF PORTABLE RAPID DETECTOR OF CONTAMINATION IN FRUITS AND VEGETABLES

摘要

Rapid testing technology played a key role in managing the traceability system of agricultural products safety. The performance of a newly-developed portable rapid detector of contamination in fruits and vegetables (PRD) with GPS was tested in lab, by detecting the content of nitrite, heavy metal and pesticide in different samples. The detection range of nitrite, lead, phoxim, trichlorfon, carbofuran and methomyl was respectively 1.5-150μg/ml, 0.5-4.0μg/ml, 0.005-2.0μg/ml, 0.005-0.5μg/ml, 0.005-0.3μg/ml and 0.005-1.0μg/ml. Precision tests, made on different concentration levels, gave values of RSD in the ranges of 2.6-8.9% for lead, and less than 2% for nitrite, and the sensitivity of the four pesticides ranged from 31.368 to 62.05. The results show that, compared with Optizen 2120V-FT machine, the accuracy and precision of PRD for the three kinds of contamination can fairly meet the requirement of rapid detection. The PRD is more simple, rapid, portable and feasible for application.