- 25 ml of a sludge sample was filtered through a standard filter paper weighing 1.1234 g and dried at 105C in an oven. The weight of the filter paper after drying in the oven was 1.2345 g. The filter paper was then ignited in a muffle furnace at 550C and the weight of the residue after ignition was 0.0234 mg/L. i. ii. Determine the TSS, VSS and fixed suspended solid in the sample in mg/L. (7 marks) Comment on the impact on the test results if the muffle furnace temperature was set at 900C by mistake. (3 marks)