SAMPLER: FILTER + TREATED FILTER (cellulose + Na2CO3; preceded by 0.8-μm cellulose ester membrane) FLOW RATE: 0.5 to 1.5 L/min VOL-MIN: 4 L @ 5 ppm -MAX: 200 L SHIPMENT: routine SAMPLE STABILITY: not determined FIELD BLANKS: 2 to 10 field blanks per set