Question

Lead Poisoning occurs when the lead content in water exceeds ______.
1. 0.5 ppm
2. 0.05 ppm
3. 0.15 ppm
4. 0.1 ppm

Answer 1

Correct Answer - Option 2 : 0.05 ppm

Explanation:

• This colorless, odorless, and tasteless metal can go undetected in water.
• Lead is toxic to many organs and tissues including the heart, bones, kidney, intestine, reproductive and nervous systems.
• Its value maintains as low as possible. Its value not exceeding 0.05 ppm.

Metals are classified into two types:

1) Toxic metal: Examples of toxic metals are arsenic, barium, cadmium, chromium, cyanide, lead, and mercury.

2) Non-toxic metal: Examples of non-toxic metals are Ca, K, Zn, Mn, and Fe, etc.

Parameter	Permissible Limit	Cause for Rejection
Total suspended solids	500 mg/l	2000 mg/l
Turbidity	1 NTU	10 NTU
Colour	5 TCU	25 TCU
Taste and odour	1 TON	3 TON
Total dissolved solid	500 mg/l	2000 mg/l
Alkalinity	200 mg/l	600 mg/l
pH	7-8.5	<6.5 & > 9.2
Hardness	200 mg/l	600 mg/l
Chloride content	250 mg/l	1000 mg/l
Free ammonia	0.15 mg/l	0.15 mg/l
Organic ammonia	0.3 mg/l	0.3 mg/l
Nitrite	0 mg/l	0 mg/l
Nitrate	45 mg/l	45 mg/l
Fluorides	1 mg/l	1.5 mg/l
Fe	0.1 mg/l	1 mg/l
Mn	0.05 mg/l	0.5 mg/l
Cu	0.05 mg/l	1.5 mg/l
Zn	5 mg/l	15 mg/l
Phenolic compound	0.001 mg/l	0.002 mg/l
Arsenic	0.01 mg/l	0.05 mg/l
Sulphate	200 mg/l	400 mg/l
Calcium	75 mg/l	200 mg/l
Mercury	0.001 mg/l	0.001 mg/l