Quality Assurance. Field and laboratory blanks were routinely monitored and in most cases were under the LOD. The mean recoveries of surrogate standards ranged from 79% to 104% with a relative standard deviation (RSD) less than 12%, which is within the acceptable 70% to 130% range set by the U.S. EPA Method 23. The samples were extracted with a blank, which consisted of
a Soxhlet thimble containing anhydrous sodium sulfate. Method detection limit and quantification limit values were calculated from the variance associated with replicate analysis (n = 5), and the details are available in the Supporting Information (Table S1). The international toxic equivalent (I-TEQ) was calculated using the international toxic equivalence factor.22 In the case of values below the LOD, I-TEQ was calculated by using the half of the LOD.
The concentrations are presented in picogram per cubic meter (pg/Nm3, standard conditions) for gaseous samples and picogram per gram (pg/g, oven-dried basis) for solid samples.
Quality Assurance. Field and laboratory blanks were routinely monitored and in most cases were under the LOD. The mean recoveries of surrogate standards ranged from 79% to 104% with a relative standard deviation (RSD) less than 12%, which is within the acceptable 70% to 130% range set by the U.S. EPA Method 23. The samples were extracted with a blank, which consisted ofa Soxhlet thimble containing anhydrous sodium sulfate. Method detection limit and quantification limit values were calculated from the variance associated with replicate analysis (n = 5), and the details are available in the Supporting Information (Table S1). The international toxic equivalent (I-TEQ) was calculated using the international toxic equivalence factor.22 In the case of values below the LOD, I-TEQ was calculated by using the half of the LOD.The concentrations are presented in picogram per cubic meter (pg/Nm3, standard conditions) for gaseous samples and picogram per gram (pg/g, oven-dried basis) for solid samples.
การแปล กรุณารอสักครู่..
