13
Cyanide pollutants
Source
Industrial sewage , electroplating, coking, gas, metallurgy, petrochemical
Harm
Highly toxic Inhibition of enzyme activity Inhibit the biological respiration Central nervous system suppression
Biological factor Chemistry factor
Physical factor
Gas Water Soil
2
3
Features of pollutant
Great variety Low concentration Great harm Last long
4
Pollutant and food safety
Harm
Highly toxic 、 carcinogenic Difficult to degrade, half life in body is 7 years.
8
3,4 benzopyrene
Source Burning of Coal, gasoline, cigarette
Source
Industrial waste ：77% Domestic waste ：23%
10
Phenolic pollutants
Source
Manufacturing of gas, coke, plastics, chemical fiber
Property
Make the protein coagulation Toxic effect to all living things
Harm
Danger to plants and animals Poor harvest Bad quality of water
7
Dioxins
Source Burning of organic chemicals and garbage which containing Cl
Inorganic toxic—heavy metal、 cyanide … Organic toxic—phenol、 pesticides … Pathogen—virus、 parasite…
Soil pollutant
5
Gas Pollutant and food safety
Source Fuel consumption, industrial production
and transportation
6
Acid rain
Definition： acid precipitation , pH＜5.65。
Source：SO2和 NOX

Sulfuric acid, nitric acid
11
Phenolic pollutants
12
Harm
Harm to Fish ,microorganisms, crops 0.1～0 .2 mg/L, fish can not be eat 6.5～9.3 mg/L, damage fish gills and pharynx, lead to abdominal bleeding Higher than 100 mg/L, causing crops withered Vomiting, diarrhea, loss of appetite, dizziness
14
Soil Pollutant and food safety
Definition
Harmful substances produced by human activities into the soil, 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.
Harm Carcinogenic, mutagenic
9
Water Pollutant and food safety
Definition
Pollutants go into rivers, lakes, oceans, change the biological properties or communities, thereby reducing the water use value.
Environmental pollutant
And
Food safety
Yuan Lei 11513026
1
What is environmental pollutant
Adverse effects of the decline in the quality of human beings and other living beings caused by human activities
A vital factor which impact on food safety
Gas pollutant
Harmful gas —SO2、CO、 hydrocarbons … Particulate matter—dust、 acid mist 、 haze …
Water pollutant
15
Source
Industrial waste, chemical pesticides, biological pathogens
16
Main Pollutants
Phenolic pollutants and Cyanide pollutants Heavy Metal
mercury, arsenic, cadmium, chromium Sludge, waste