Question

One JTU is equivalent to turbidity produced by __________

(a) 1mg of fine silica dissolved in 1L of distilled water

(b) 1g of fine silica dissolved in 1L of distilled water

(c) 1g of fine silica dissolved in 1ml of distilled water

(d) 1mg of fine silica dissolved in 1ml of distilled water

The question was posed to me in an interview.

Enquiry is from Physical characteristic of Water in division Quality of Water of Environmental Engineering

Answer 1

Right option is (a) 1mg of fine silica dissolved in 1L of distilled water

For explanation: 1 JTU is equivalent to turbidity produced by 1mg of fine silica dissolved in 1L of distilled water. It is called as Jackson’s turbidity unit and is based on the absorption principle.