Question
Download Solution PDFMatch the following with respect to IS specifications on drinking water quality as per IS 10500-2012.
|
Characteristics |
Acceptable limit |
||
|
1. |
Calcium |
a. |
250 mg/l |
|
2. |
Chloride |
b. |
75 mg/l |
|
3. |
Fluoride |
c. |
0.2 mg/l |
|
4. |
Free residual chlorine |
d. |
1.0 mg/l |
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
As per IS 10500: 2012, following are the various permissible limits for different parameters:
| Parameters | Acceptable Limit | Permissible limit in absence of alternate source |
| Total suspended solids | 500 | 2000 |
| Turbidity (NTU) | 1 | 5 |
| Colour (TCU) | 5 | 25 |
| Taste & Odour (TON) | 1 | 3 |
| Total dissolved solids (mg) | 500 | 2000 |
| Alkalinity | 200 | 600 |
| pH | 7-8.5 | <6.5 & >9.2 |
| Hardness (mg/L) | 200 | 600 |
| Chloride content (mg/L) | 250 | 1000 |
| Free ammonia (mg/L) | 0.15 | 0.15 |
| Nitrate (mg/L) | 45 | No Relaxation |
| Fluoride content (mg/L) | 1 | 1.5 |
| Iron as Fe (mg/L), max | 0.3 | No Relaxation |
| Sulphate (mg/L) | 200 | 400 |
| Calcium (mg/L) | 75 | 200 |
| Free residual chlorine (mg/L) | 0.2 | No Relaxation |
Additional InformationIron is found on earth mainly as insoluble ferric oxide. Iron can impart a bad taste to the water, causes discolouration in clothes, and incrustations in water mains.
- As it contains multivalent cations which are responsible for hardness in water.
- Reaction of iron oxide with water will lead to an increase in the concentration of CO2 which is responsible for the corrosiveness in water.
- As the colour of iron oxide is red, so it induces red colour in water.
- The presence of iron oxide does not cause a toxic effect in the water.
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