Acceptable. Procedure in TSS SM 2540 N/A Choose a sample volume SOP does not meet D-2011 to yield between 2.5 and requirements of SM Section 200 mg of dried residue. 2540 D. 3c The filter must be washed 3 times with 10mL Minimum residue successive washes. not specified. After filtration of Filter rinsed sample and washings is once with 10ml complete, analyst shall ultra-pure continue suction for 3 water. minutes. Filtration for Analyst must repeat 1-2 minutes cycle of drying, post-rinse. cooling, desiccating, Filter and weighing samples desiccation and until the weight change weighing is less than 4% of the repeated, but previous weight or 0.5 drying not mg, whichever is less. repeated. Acceptable duplicate Acceptance must be within 5% of the criteria for average weight of the duplicates is sample and sample 20% RPD. duplicate.
Procedure in TSS SOP does not meet requirements of SM 2540 D. Minimum residue not specified. Filter rinsed once with 10ml ultra-pure water. Filtration for 1-2 minutes post-rinse. Filter desiccation and weighing repeated, but drying not repeated. Acceptance criteria for duplicates is 20% RPD. Choose a sample volume to yield between 2.5 and 200 mg of dried residue. The filter must be washed 3 times with 10mL successive washes. After filtration of sample and washings is complete, analyst shall continue suction for 3 minutes. Analyst must repeat cycle of drying, cooling, desiccating, and weighing samples until the weight change is less than 4% of the previous weight or 0.5 mg, whichever is less. Acceptable duplicate must be within 5% of the average weight of the sample and sample duplicate. SM 2540 D-2011 Section 3c Acceptable. N/A