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Data Series 286

U.S. GEOLOGICAL SURVEY
Data Series 286

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Table 2. Results for organochlorine compounds in standard reference material and percent recovery of spiked surrogate compounds, May and June 1999.

[All values are in micrograms per kilograms unless otherwise noted. Standard reference material analyses for each batch of field samples. Abbreviations: ng/g, nanogram per gram; ND, not detected above reporting limit; <5.0, compound not present above the reporting level; E, estimated concentration; <, less than]

Compound Standard reference material analyses Average Expected concentration
May 1999 June 1999 (ng/g) Range
alpha-HCH 1<5.0 87 58 87 37 74 88 62 86 67–105
HCB 1160 120 70 130 E57 E130 120 112 148 127–169
trans-chlordane 1<5.0 30 22 34 E14 37 46 26 50 37–63
cis-chlordane 1110 140 97 160 54 130 140 119 158 150–166
trans-nonachlor 1130 182 E136 200 71 E171 188 154 209 198–220
p,p’-DDE 1380 450 240 420 214 418 E420 363 641 579–703
Dieldrin 1<5.0 140 100 150 72 150 180 113 150 138–162
p,p’-DDD 1<5.0 <5.0 <5.0 180 83 180 180 89 277 262–292
o,p’-DDT 1<5.0 <5.0 <5.0 <5.0 48 88 <5.0 19 156 151–161
p,p’-DDT 1<5.0 410 300 530 170 420 E540 339 529 484–574
Surrogate recovery (percent recovery)
Decafluorobiphenyl 65 61 2103 83 33 90 71 67
alpha-HCH-d6 89 71 2142 86 38 79 97 77
Nonachlorobiphenyl 75 83 2132 86 39 82 86 75
p,p’-DDT-d8 ND 58 2131 90 42 91 105 77

1GPC fraction problems with standard reference material.

2Suspect samples double surrogated.

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