[Investigation of dietary intake of cadmium in certain polluted area of south in China].

OBJECTIVE: To investigate the situation of dietary intake of cadmium and provide evidence for Cd pollution prevention and control in the south area in China. METHODS: Three types of local food sample, including cereals, vegetables, meat and eggs, were collected and detected for cadmium content. Dietary survey was carried out in the local resident in the same time. RESULTS: 140 food samples were collected from 54 households. 71.69% of rice were above the limitation of the cadmium content according the national standard. Dietary survey conducted in 262 residents showed that the main food was rice. Thus, cadmium intake from the rice was one of the major dietary sources in this area, and cadmium intake from rice was different from the age group. The average cadmium intake for one's lifetime was at least 4 g in this area. CONCLUSION: Cadmium pollution prevention and control should be focused on the food chain from crops to the human being in this contaminated area.

[A following up survey on cadmium level in rice in contaminated area, Jiangxi Province].

OBJECTIVE: To observe rice cadmium level in a contaminated area where has being continuously polluted for 19 years since last investigation. METHODS: Samples of late rice (polished) grown in 2006 were collected from farmer household in contaminated and control area and its cadmium concentration were detected with IPC-MS. RESULTS: Samples of polished rice from the polluted and control areas were detected. The average cadmium concentration from last investigation area 19 years before was 0.59 mg/kg (0.05 mg/kg for rice from control area), it upraises about 30% corresponding to average of rice from the same areas detected before 19 years. The average cadmium level of rice from whole contaminated areas (including last investigation and expanding areas) was 0.26 mg/kg and it is greater than that in control areas (0.06 mg/kg) and the limited value of national hygiene standard (< 0.20 mg/kg). There was about 64%, 23.17% and 11% of samples have higher level than 0.20 mg/kg (the limited value of national hygiene standard), 0.4 mg/kg (the limited value of Codex General Standard) and 1.0 mg/kg (cadmium-rice) respectively. There was a higher percentage (36.8%) of Cadmium-rice (greater than 1.0 mg/kg) in some heavy contamination villages. CONCLUSION: Environmental cadmium pollution has being existing for 19 years since last investigation. Average cadmium concentration of rice from whole country polluted areas was higher than that of national hygiene standard. Percentage of "cadmium-rice" might be higher in some villages.