TABLE 4.-CHROMATOGRAPHIC CONDITIONS, METHOD DETECTION LIMITS, AND CHARACTERISTIC MASSES FOR BASE/NEUTRAL EXTRACTABLES-Continued

• These compounds are mixtures of various isomers (See Figures 2 through 12). Column conditions: Supelcoport (100/120 mesh) coated with 3% SP-2250 packed in a 1.8 m long x 2 mm ID glass column with helium carrier gas at 30 mL/min. flow rate. Column temperature held isothermal at 50 °C for 4 min., then programmed at 8 °C/min. to 270 °C and held for 30 min.

TABLE 5.-CHROMATOGRAPHIC CONDITIONS, METHOD Detection LIMITS, AND CHARACTERISTIC MASSES FOR ACID EXTRACTABLES

Column conditions: Supelcoport (100/120 mesh) coated with 1% SP-1240DA packed in a 1.8 m long x 2mm ID glass column with helium carrier gas at 30 mL/min. flow rate. Column temperature held isothermal at 70 °C for 2 min. then programmed at 8 °C/min. to 200 °C.

TABLE 6.-QC ACCEPTANCE CRITERIA-METHOD 625—Continued

NOTE: These criteria are based directly upon the method performance data in Table 7. Where necessary, the limits for recovery have been broadened to assure applicability of the limts to concentrations below those used to develop Table 7. • The proper chemical name is 2,2'oxybis(1-chloropropane).

TABLE 7. METHOD ACCURACY AND PRECISION AS FUNCTIONS OF CONCENTRATION-METHOD 625

X' = Expected recovery for one or more measurements of a sample containing a concentration of C, in μg/L.
s, Expected single analyst standard deviation of measurements at an average concentration found of X, in μg/L.
S' Expected interlaboratory standard deviation of measurements at an average concentration found of X, in μg/L.
C=True value for the concentration, in μg/L.

X=Average recovery found for measurements of samples containing a concentration of C, in μg/L
⚫The proper chemical name is 2,2′oxybis(1-chloropropane).