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
