Cooking Fuel And Food Samples Of PAHs Content Relationship Research

PAHs are organism, such as coal, petroleum, timber, tobacco, organic polymers, produced by incomplete combustion of volatile hydrocarbons, there are important environmental and food contaminants.Hitherto, investigators found more than 200 kinds of PAHs, of which a considerable part of carcinogenicity, for exemple, benzo [a] pyrene, benzo[a] anthracene, etc. PAHs are widely distributed in the environment through air, water, food, smoking uptake, which are great harmful to human health. This study is to determine different fuels(coal, natural gas, biogas, straw)when cooking, in 8 classes daily food, including flour, rice, soy, eggs, meat, fish, potatoes and vegetables, PAHs content changed, and in the process of cooking, different fuels on the content of PAHs in food. The results for the control of pollution sources of PAHs in food and the level of exposure, effective crowd control content of the dietary intake of PAHs provides a scientific basis.Objective:1. Preliminary understanding of impact on indoor air quality by use different fuels when cooking and to study the dietary sources of PAHs provided clues.2. Comparison of food samples PAHs content by different fuels to cook and to estimate the dietary intake of PAHs provided a scientific basis.Methods:According to preliminary results of dietary surveys select one Village, one County, Huaian City, Anhui Province which is food samples production site, it guarantees that all other factors are consisten in the scene except for the fuel samples. Production of food samples while monitoring the indoor air quality. Detected the content of PAHs in air and food samples, analyzed and sorted out the results, studied the relationship between cooking fuel and PAHs content in food samples.Results:1. Air quality when prepared of food samples by different fuelDuring the same sample produced by four kinds of fuel and normal cooking, CO and CO2 concentration generally showed an upward trend. When used different fuel samples produced the same food sample, the coal groups of air CO content are the highest, the highest CO concentration appeared in the production process of rice samples, flour samples and potato samples, for 23.8ppm; CO2 concentration of liquefied gas group in production process of food samples are the highest expect that coal group producted meat and fish samples. The highest CO2 concentration appeared in the production process of bean, eggs and vegetable samples, for 1156.8ppm.2. PAHs content in airAttached to particles of PAHs in air is below four rings major. In the production of different samples, the attached particles of below four rings PAHs concentration and total PAHs concentration were the highest, which is the straw group.Gaseous PAHs in the air is below four rings major, it accounts for 90% of total gaseous PAHs above. When producted food samples by different fuels, in each fuel group, air gaseous PAHs concentration of below four rings are higher than above four rings.Total PAHs in the air of below four rings is major, it accounted for more than 90% of the total PAHs. PAHs content in air of gaseous PAHs is main, it account for the total PAHs in air more than 70%. Total PAHs concentration of straw group in other production process of food samples are the highest expect production of rice, flour and potato sample. The highest total PAHs concentration appeared in the production process of meat and fish samples,for 1.8228ppm, that is 1.47 times of blank controller.3. PAHs content in food samplesWhen producted food samples with different fuels, PAHs concentration of below four rings are most higher than above four rings, it account for the total PAHs more than 90%. Liquefied gas group of PAHs content in the diet are the most highest. The highest PAHs concentration appeared in the production process of bean samples in liquefied gas group, for 576.8μg/kg, the lowest appeared in the production process of flour samples in straw group, for 36.2μg/kg ; after application of TEFs corrected, coal group of BaP equivalent are the most highest, the highest appeared in the production process of meat samples in coal group, for 0.8357μg/kg.4. Different fuels group by dietary intake of PAHs contentDifferent fuels groups per capita daily intake each PAHs content is different, total per capita daily intake PAHs of liquefied gas group is highest(752.9390μg/d), followed by coal group(515.9798μg/d), the lowest methane group(101.9198μg/d). Application of TEFs corrected the potential toxicity of PAHs in sample, after corrected the total PAHs of order is straw group>coal group>methane group>liquefied gas group.Different fuels groups per capita daily intake below four rings PAHs content are higher than above four rings. Liquefied gas group per capita daily intake below four rings, above four rings and total PAHs is the highest, methane group is the lowest.5. Cancer riskStraw group residents dietary intake PAHs of carcinogenic risk is greatest, for 2.19×10-3. Liquefied gas group is lowest, for 1.29×10-3. In 4 fuel groups the cancer risk to human order is straw group>coal group>liquefied gas group>methane group.Conclusions:1. Influence of coal combustion is major than any other fuel in terms of indoor air CO and CO2 content increased.2. Cooking process can increase content of PAHs in indoor air.(1) Gaseous PAHs is significantly higher than attached to particulate matter of PAHs.(2) Below four rings PAHs is significantly higher than above four rings PAHs. (3) PAHs content by straw burning is the highest.3. Cooking process caused that the content of PAHs in food samples increased.(1) PAHs content in food samples is greater than the content of PAHs in the diet materials after production of different cooking fuels.(2) PAHs concentration of below four rings are most higher than above four rings.(3) Liquefied gas group of PAHs content in the diet are the most highest expect meat, eggs and potato samples.4. Intake of PAHs is serious excessive: resident of different fuels groups per capita dietary intake of BaP equivalent range of PAHs is 10.6047μg/kg to 17.9808μg/kg. Straw group is the highest, the lowest is liquefied gas group.5. When used different fuels, dietary intake of PAHs by residents of the carcinogenic risk is higher than maximum acceptable level of chemical carcinogens that recommended by the International Commission on Radiological Protection, for 5×10-5. straw group is the highest, for 2.19×10-5, that is 43.8 times of maximum acceptable level.