3
Restek
Tip
How to Bake Sodium Sulfate
Tobake the sodium sulfate, spread it
into a glass pie plate nomore than
1" thick andplace into amuffle
furnace at 400°C for aminimumof
twohours.After this time, the
sodium sulfate shouldbeplaced into
a glass containerwhile still hot and
sealedwith aTeflon
®
-lined cap to
prevent thematerial from
readsorbingcontaminants from the
atmosphere.
Table I.
Semivolatile organic compounds listed inUSEPAMethods 8270, 525, and625.
Peak
Number Compound
1
2-fluorophenol
2
phenol-d6
3
phenol
4
bis(2-chloroethyl) ether
5
2-chlorophenol-d4
6
2-chlorophenol
7
1,3-dichlorobenzene
8
1,4-dichlorobenzene-d4 (ISTD)
9
1,4-dichlorobenzene
10
benzyl alcohol
11
1,2-dichlorobenzene-d4
12
1,2-dichlorobenzene
13
2-methylphenol (o-cresol)
14
2,2'-oxybis-(1-chloropropane)
15
4-methylphenol (p-cresol)
16
N-nitrosodi-
n
-propylamine
17
hexachloroethane
18
nitrobenzene-d5
19
nitrobenzene
20
isophorone
21
2-nitrophenol
22
2,4-dimethylphenol
23
bis(2-chloroethoxy)methane
24
benzoic acid
25
2,4-dichlorophenol
26
1,2,4-trichlorobenzene
27
naphthalene-d8 (ISTD)
28
naphthalene
29
4-chloroaniline
30
hexachlorobutadiene
31
4-chloro-3-methylphenol
32
2-methylnaphthalene
33
hexachlorocyclopentadiene
34
2,4,6-trichlorophenol
35
2,4,5-trichlorophenol
36
2-fluorobiphenyl
37
2-chloronaphthalene
38
2-nitroaniline
39
dimethyl phthalate
40
2,6-dinitrotoluene
41
acenaphthylene
42
3-nitroaniline
43
acenaphthene-d10 (ISTD)
44
acenaphthene
45
2,4-dinitrophenol
46
4-nitrophenol
47
dibenzofuran
48
2,4-dinitrotoluene
49
diethyl phthalate
Peak
Number Compound
50
fluorene
51
4-chlorophenyl phenyl ether
52
4-nitroaniline
53
4,6-dinitro-2-methylphenol
54
N-nitrosodiphenylamine
55
2,4,6-tribromophenol
56
4-bromophenyl phenyl ether
57
α
-HCH
58
hexachlorobenzene
59
β
-HCH
60
pentachlorophenol
61
γ
-HCH (Lindane)
62
phenanthrene-d10 (ISTD)
63
phenanthrene
64
anthracene
65
δ
-HCH
66
carbazole
67
heptachlor
68
di-
n
-butyl phthalate
69
aldrin
70
heptachlor epoxide
71
fluoranthene
72
endosulfan I
73
pyrene
74
4,4'-DDE
75
p
-terphenyl-d14
76
dieldrin
77
endrin
78
endosulfan II
79
4,4'-DDD
80
endrin aldehyde
81
butyl benzyl phthalate
82
4,4'-DDT
83
endosulfan sulfate
84
endrin ketone
85
methoxychlor
86
3,3'-dichlorobenzidine
87
benzo(a)anthracene
88
chrysene-d12 (ISTD)
89
chrysene
90
bis(2-ethylhexyl)phthalate
91
di-
n
-octyl phthalate
92
benzo(b)fluoranthene
93
benzo(k)fluoranthene
94
benzo(a)pyrene
95
perylene-d12 (ISTD)
96
ideno(1,2,3-cd)pyrene
97
dibenz(a,h)anthracene
98
benzo(g,h,i)perylene
Theoptimumway to remove thewater is todecant thedichloromethane throughgranular
sodium sulfate,which is held in a funnelwith a high-qualitygrade filter paper (e.g.,
Whatman
®
541).Approximately30gof sodium sulfate are sufficient formost samples. This
stepmust not be skipped.Methodsmay call for powdered sodium sulfate, but some analytes
canbe adsorbedonto the smaller particles so it is recommended that only10-60meshor
similar granular sodium sulfate be used.Also, it is important that thismaterial be contami-
nant-free, so it shouldbe purchased asAmericanChemical Society (ACS) pesticide residue-
grade inglass containers or baked in amuffle furnace if purchased inbulkpackageswhere
exposure toplastic is an issue (seeRestekTip). If amuffle furnace is not available, the
sodium sulfate canbewashedor extractedwithdichloromethaneprior touse; however this
techniqueuses large amounts of solvent.
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