Cadmium contamination in green leaves grown in Madurai District, India.
Three green leaves (Amaranthus dubius, Basella alba, Alternanthera sessilis) collected from five sites near Vaigai river at Madurai District were analyzed for cadmium contamination using Atomic absorption spectrophotometer. This study explains the level of cadmium contamination during summer and rainy season in Madurai District. Results showed that cadmium concentration in all three green leaves at site-1 and site-2 crossed permissible limit recommended by Indian Standard (Awashthi 2000) during rainy season. Nevertheless, cadmium concentration in all samples at the selected sites was high in rainy season than the summer season. However, Amaranthus dubius leaf contains high level of cadmium in sites during summer and rainy season. This extent of contamination in green leaves may be due to excessive discharge from automobile, industry and agricultural practices in Vaigai river. Hence proper monitoring of metals in green leafy vegetables grown very near to Vaigai river is mandatory. This could prevent excessive metal accumulation in food chain. Also, the cultivators shall be given proper awareness to cultivate the crop in healthy sites.