| Parameters | MAC (µg/l), WHO, EU and Canadian | Potential health effects | Source of contaminants | |
|
|
| Deficiency | Abundance |
|
| As | 10 | -Insufficient hair growth -Spleen enlargement | -Skin cancer -Tumours of bladder, kidney, liver and lungs. | -Natural deposit, electronic waste. |
| Pb | 10 |
| -Kidney, liver, heart and nervous system damage. | -Natural and industrial deposits. |
| Se |
10 | -Breast, gastrointestinal and skin cancer. -Liver damage and heart muscle disorder | -Hair and nail loss -Nervous disorder | -Natural deposit, mining, smelting and coal combustion |
| Tm | 10 |
| -Kidney, liver, brain and intestinal effects | -Electronic, drug and alloy |
| Br | 10 |
| -Malfunctioning of nervous system -Liver, kidney, lung and thyroid gland damage. | -Natural deposit |
| Cr | 50 | -Diabetes | -Liver, kidney and circulatory system disorders -Lung cancer | -Natural deposit, mining electroplating. |
| Cu | 1000 | -Anemia | -Gastrointestinal irritation | -Natural/industrial deposit, wood preservation |
| Al | 100 |
| -Kidney and liver damage -Dementia, colic and esophagitis | -Natural/industrial deposits |