环境污染物与食品安全.ppt

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1、Environmental pollutantFood safety1What is environmental pollutanto Adverse effects of the decline in the quality of human beings and other living beings caused by human activitiesBiological factorChemistry factorPhysical factor Gas WaterSoil23Features of pollutant n Great varietyn Low concentration

2、n Great harmn Last long 4Pollutant and food safetyo A vital factor which impact on food safetyo Gas pollutantnHarmful gas SO2、CO、 hydrocarbons nParticulate matterdust、 acid mist 、 haze o Water pollutantnInorganic toxicheavy metal、 cyanide nOrganic toxicphenol、 pesticides nPathogenvirus、 parasiteo So

3、il pollutant5Gas Pollutant and food safetyn Source Fuel consumption, industrial production and transportation6Acid raino Definition： acid precipitation , pH5.65。o Source：SO2和 NOX Sulfuric acid, nitric acido HarmnDanger to plants and animalsnPoor harvestnBad quality of water 7Dioxinso Source Burning

4、of organic chemicals and garbage which containing Clo HarmnHighly toxic 、 carcinogenicnDifficult to degrade, half life in body is 7 years.83,4 benzopyreneo Source Burning of Coal, gasoline, cigaretteo Harm Carcinogenic, mutagenic9Water Pollutant and food safetyo Definition Pollutants go into rivers,

5、 lakes, oceans, change the biological properties or communities, thereby reducing the water use value.o SourceIndustrial waste ：77%Domestic waste ：23%10Phenolic pollutantso SourceManufacturing of gas, coke, plastics, chemical fibero Property Make the protein coagulation Toxic effect to all living th

6、ings11Phenolic pollutants12o Harm Harm to Fish ,microorganisms, cropso 0.10 .2 mg/L, fish can not be eato 6.59.3 mg/L, damage fish gills and pharynx, lead to abdominal bleedingo Higher than 100 mg/L, causing crops withered o Vomiting, diarrhea, loss of appetite, dizziness13Cyanide pollutantso Source

7、 Industrial sewage , electroplating, coking, gas, metallurgy, petrochemical o HarmnHighly toxicnInhibition of enzyme activitynInhibit the biological respiration nCentral nervous system suppression14Soil Pollutant and food safetyo Definition Harmful substances produced by human activities into the so

8、il, when its content exceeds the soil itself self-purification capacity, soil composition and the nature change, reducing the quality of crop yields, and endanger human health.15o SourceIndustrial waste, chemical pesticides, biological pathogens16Main Pollutantso Phenolic pollutants and Cyanide poll

9、utantso Heavy Metal mercury, arsenic, cadmium, chromiumo Sludge, waste17Heavy Metal Pollutants o PropertynFixed to the soil in the form of Hydroxides, sulfates, sulfides, carbonates or phosphatesnDifficult to migrate, continue to accumulate, show harm when to some extentnHigh Soil residual rate, 90%

10、nDo not disappear, long half-life18o Mercuryn Source： Industrial waste, pesticides, waste batteriesn Toxicity Alkyl mercury divalent mercury elemental mercury 19o Harm nLow dosagethrough feces, urine, sweat, no harmnHigh dosage Acute poisoningnLong time intake Minamata disease Harm to nervous system

11、 and organs20oLimits o Aquatic products 0.3mg/kg； Meat、egg、oil 0.05mg/kg Grain 0.02mg/kg Vegetable and fruit 0.01mg/kg21o Pbn Sourceo Pb compounds used in industrial and agriculturalo Pesticides, paints, pigmentso Food containers, pipes, equipment22n Harm o Acute poisoning Nausea, vomiting, constipa

12、tion, headache, dizziness, pale skino Subacute poisoning Nausea, vomiting, constipation or diarrhea, abdominal cramps; enlargement of the livero Chronic poisoning Peripheral neuritis, anemia, Liver and kidney damage23oLimits Beans 0.1mg/kg Meat 0.5mg/kg Grain 0.4 mg/kg Vegetable and fruit 0.2mg/kg24o Cadmiumo SourceCadmium pollutantsFood containero Harm Accumulate in kidney and other organs Precipitation of calcium, osteoporosis Itai-itai disease Teratogenic, mutagenic 25oLimits Beans 0.1mg/kg Meat and fish 0.1mg/kg Grain 0.2 mg/kg Vegetable and egg 0.05mg/kg26