Page:NIOSH Manual of Analytical Methods - 8326.pdf/10

 S-Benzylmercapturic acid and S-phenylmercapturic acid in urine: METHOD 8326, Issue 1, dated 20 May 2014 - Page 10 of 10

Table 4. INDIVIDUAL SMOKER and NON-SMOKER RECOVERY EXPERIMENT of BMA and PMA Background Level Individual Sample

Fortified Urine (background + 6 ng/mL)

Fortified Urine Recovery

BMA (ng/ mL)

PMA (ng/ mL)

BMA (ng/ mL)

PMA (ng/mL) BMA [ng/mL (percent)]

PMA [ng/mL (percent)]

Smoker 1

2.7

0.2

8.7

6.2

8.6 (99%)

6.5 (104%)

Smoker 2

28.3

0.3

34.3

6.3

34.7 (101%)

6.9 (108%)

Smoker 3

15.9

0.9

21.9

6.9

21.3 (97%)

7.9 (114%)

Smoker 4

5.7

0.3

11.7

6.3

11.6 (99%)

7.7 (121%)

Smoker 5

1.3

nd

7.3

6.0

6.9 ( 95%)

6.4 (106%)

Smoker 6

9.2

0.7

15.2

6.7

15.5 (102%)

7.0 (104%)

Mean

10.5

0.4

16.5

6.4

16.4 (99%)

7.1 (110%)

Non-smoker 1 0.3

nd

6.3

6.0

6.2 ( 98%)

6.2 (103%)

Non-smoker 2 7.1

nd

13.1

6.0

14.3 (109%)

7.4 (123%)

Non-smoker 3 6.8

nd

12.8

6.0

13.1 (102%)

6.8 (112%)

Non-smoker 4 23.3

nd

29.3

6.0

28.6 ( 97%)

6.3 (105%)

Non-smoker 5 4.7

nd

10.7

6.0

11.0 (103%)

6.3 (105%)

Non-smoker 6 7.2

nd

13.2

6.0

13.5 (102%)

6.1 (101%)

Mean

-

14.2

6.0

14.5 (102%)

6.5 (108%)

Notes:

8.2

The instrumental limit of detection (LOD) was estimated to be approximately 0.2 ng/mL for both analytes. The lowest standard value was 0.5 ng/mL for both analytes. [Values near the LOD were reported to one significant figure.] nd = none detected (< 0.2 ng/mL)

NIOSH Manual of Analytical Methods (NMAM), Fifth Edition