Page:NIOSH Manual of Analytical Methods - 9109.pdf/20

 METHAMPHETAMINE. . . on Wipes by SPE: METHOD 9109, Issue 1, dated 17 October 2011 - Page 20 of 33

Table 10a. Recovery from wall (latex painted) with various solvents; one wipe compared with the sum of two wipes(1,2) Water(3)

First Wipe Test Compounds(5)

Percent

%RSD

Isopropanol Plus Second Wipe(4) Percent

First Wipe

Methanol

Plus Second Wipe(4) Percent

First Wipe

Plus Second Wipe(4)

Percent

%RSD

Percent

%RSD

Percent

Amphetamine

51

14

56

67

6.0

78

90

4.0

96

Cocaine

36

22

36

69

22

80

89

9.1

94

Ephedrine

48

23

52

76

7.4

85

91

4.4

96

MDMA

40

20

44

61

9.0

70

88

5.3

94

MDEA

45

22

50

69

12

80

90

11

97

Methamphetamine

46

16

50

64

7.4

75

87

3.5

94

Phencyclidine

27

26

30

64

9.6

73

86

5.2

91

Phentermine

53

9.2

58

78

6.6

91

95

2.9

101

Phenylpropanolamine

58

21

62

80

9.3

95

85

5.0

94

Pseudoephedrine

49

20

53

73

7.0

85

95

3.3

101

(1)	 Backup Data Report for NIOSH 9109 [1]. Area of each sample was 100 cm². (2)	 Wall was an existing standard gypsum board wall painted with a latex based paint. Painted surface was at least one year old. There were six replicates for each solvent tested. (3)	 Water was deionized water (ASTM type II). Note low recovery and high %RSD. (4)	 For the serial wipe study, each 100-cm² area was wiped again with a fresh pre-wetted gauze wipe and the amount recovered was determined separately. In practice, a second (serial) wipe is included with the first gauze wipe; both gauze wipes constitute a single sample. The percent recoveries shown in the column represent the sum of the amounts recovered in both the first and second wipes. (5)	 Each pre-measured area was spiked with 3 µg of each analyte in methanol and the methanol allowed to dry for several minutes prior to wipe sampling.

Method rev. 1.1.1

NIOSH Manual of Analytical Methods (NMAM), Fifth Edition