Question

Propose a suitable sample strategy for following analytical problems ,give reason for your answer
A) To study contamination of fish in a river
B)To study the effect of automobile exhaust on air quality
C)To identify ground water contamination around chemical factory
D) To determine if vegetables are contaminated with sprayed pesticides

Answer 1

A) several fish samples to be obtained with nets, chilled immediately and analyzed independently

B) samples of air to be taken periodically nearby the road, analysed independently; the results to be coorrelated with the traffic intensity (which is measured in parallel with air sampling)

C) a number of groundwater samples to be obtained from several wells, drilled around the chemical factory, tested separately and compared with allowable limits of pollutants

D) a series of vegetable samples to be taken evenly throught the land plot, tested seperetely and compared with allowable levels of residual pesticides