Occurrence and exposure assessment of heavy metals in local-planted rice collected from Fuyang district of Hangzhou

Abstract

ObjectiveTo provide theoretical guidance and decision-making basis for food security in Fuyang district， the levels of lead， cadmium， chromium and arsenic in native rice in Fuyang district in Hangzhou were studied， and the potential risk of eating native rice to human health was evaluated.Methods450 representative and mature rice samples were collected from 8 areas in Fuyang from 2018 to 2020. The other 50 samples from the supermarket were used as the control group. The pretreatment conditions of microwave digestion were optimized and then the exposure amount of heavy metals were detected according to Chinese national standards. And the risk assessment was carried out by MOS or MOE method.ResultsThe average values of lead， cadmium， chromium and arsenic in native rice samples were 38.0， 180， 83.8， 77.2 μg/k， respectively. The qualified rate of lead， chromium and inorganic arsenic in native rice was 100%. The over-limit rate of cadmium in native rice was 26%， and the qualified rate of commercial rice in control group was 100%. The exposure of lead， cadmium， chromium and arsenic to the health risk of residents were acceptable， and the risk level was Cd>Cr>Pb>As.ConclusionAccording to the results of dietary risk assessment， the health risk caused by the exposure of four heavy metals to the native rice consumed in Fuyang district is relatively low.

Keywords

• fuyang rice
• heavy metal
• exposure
• risk assessment