Concentration distribution of heavy metals in foodstuffs and health risk assessment in Taiwan population
| Autor: | Han-Ting Huang, 黃瀚霆 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 Accompany with the industry development and the increasing of environmental pollutants, the potential toxic metals (e.g. lead, cadmium and mercury) have been released into water, soil by air dispersion, wasted water, disposal of industrial wastes and overuse of agricultural purposes. Due to the heavy metals are less mobility and high residual in environment, they can accumulate in environmental easily. Therefore, people may expose to heavy metals by ingestion of contaminant food after the bio-concentration or bioaccumulation. Therefore, the present study aims to analyze the background levels ofPb and Cd in Taiwan foods. The levels of Pb and Cd are measured by Inductively coupled plasma mass spectrometry, (ICP-MS). This year, 1939 foodstuffs have been collected in the present study for metals analysis from 7 air pollution areas in Taiwan, the food item as the list: 400 for meats, 100 for viscera, 180 for eggs, 453 for grains, 239for fish and fishery products, 209for dairy products, 203for oil products, 155for babyfood. The highest Pb level are found in fish and fishery(the average level: 0.035μg/g, range: N.D-1.017μg/g), the following are baby food＞grains＞dairy＞meats, and the lowest are found in eggs products; the highest Cd level are found in fish and fishery products (the average level: 0.219 μg/g, range: N.D.-5.98μg/g). The following are grains＞viscera＞baby food, and the lowest are found in eggs. The detectable rate in each food items are as the list: in meats, for Pb, 4.3% are over Codex suggestion (0.1 μg/g); in grains, 0.2% are over Codex suggestion (0.2 μg/g) and 0.2% are over Taiwan limited (0.2 μg/g). For Pb, all of baby food under 1 year are all less than Taiwan limited (0.02 μg/g). For Cd level, in shellfish, 3.3% are over Taiwan limited (2 μg/g). Pb and Cd are carcinogens, but there is no oral slope factor for calculating the cancer risk assessment for Cd ingestion. Therefore, only non-cancer risk assessment are processed in the current program. According to the above 1939 analyzed data, the estimated cancer risk and Hazard Index (HI) of Pb from foodstuffs consumption for Taiwanese by age groups have been completed. The results showed that cancer risk are 1.02×10-6.Thehighestcancer risk in different area is in Kaung-Ping (3.58×10-6) and in Northern regions(3.43×10-6), and the lowest is in Chu-Mia(1.65×10-6). The HI calculation based on FAO suggestion and chronic reference dose (RfD) for Pb and Cd all over 1 for each age group. The data indicated that over 5 % of Taiwan population posed health risk via dietary intake containing Pb and Cd contaminants. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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