of precision and accuracy from this data. The precision for this method using these statistical procedures is: CV1 = 0.03 CV2 = 0.03 CVT = 0.03 The average recovery for sampling and analysis over all levels was 99.4%. Any variation from 100% recovery was probably related to difficulties in generating the atmosphere containing the analyte at a given concentration rather than a true bias in the method. The Bartlett's test for homogeneity of variances and an outlier test (9.7.) were applied to this data. The sampling and analysis data passed the Bartlett's test, indicating the CVs could be pooled for all sets of generated samples. One data point in the third set (2 PEL, n=5) was rejected as an outlier. 4. Collection Efficiency Procedure: The collection efficiency (CE) of MFGBs containing 0.1% sulfamic acid was assessed. A chlorine concentration of approximately 2 ppm was generated and samples were collected in series using the MFGBs. A flow rate of 1 L/min and a 15-min sampling period were used. The amount of chlorine collected in each of the two bubblers connected in series was measured. Results: The results are shown in Table 3. The CE of the single bubbler was determined to be 1.00; therefore, a recovery correction or sampling train is not necessary. 5. Breakthrough Procedure: Breakthrough is defined as the time the effluent concentration in a second bubbler (containing 0.1% sulfamic acid) connected in series reaches 5% of the concentration of the test gas mixture. A test for breakthrough was conducted at about 2 ppm and at a 1 L/min sample collection flow rate. A sample set consisting of two bubblers in series was used to collect samples for each time interval listed: 15, 30, 60, 120, 180, and 240 min. Results: No breakthrough occurred at this flow rate, during these sampling times, or at the concentration tested. The results are given in Table 4. 6. Storage Stability Procedure: A study was conducted to assess whether chlori...
