Table 2.

Average recovery rates ($\overline{\mathrm{R}}\%$) and relative standard deviations (RSD) of four IPR laboratory tests for PCBs, along with the acceptance criteria for R% and RSD% according to EPA Method 1668B.

	Laboratory Test Results		EPA 1668B Accepted Range
	IPR $\overline{\mathbf{R}}\mathbf{\%}$	IPR RSD	IPR $\overline{\mathbf{R}}\mathbf{\%}$	IPR RSD
60L	77	19	43–106	63
127L	84	10	75–102	23
159L	88	11	78–117	30