Question

There has been reported cases of microbial contamination in drinking water at your neighbourhood, and you have been contracted to undertake water quality testing of samples of the drinking water sources. i. State three ways to preserve the sample containers during the environmental sampling (6 marks) ii. Explain two ways you might contribute to the contamination of the water samples before the actual testing is done (4 marks) b. Explain why control of turbidity is considered important for disinfection of drinking water? (4 marks) c. Two 50-mL samples gave 7 colonies on one filter and 9 colonies on another filter. Estimate the coliform density (4 marks) d. Why is there a need to follow standard operating procedures when performing laboratory testing or analysis of environmental samples? (2 m