RESULTS AND DISCUSSION

Table 2. Masses of the various explosives identified in residues from the 81-mm mortar rounds detonated with C4 at Camp Ethan Allen, Vermont.

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8

in SW-846 Method 8095 (USEPA 1999, Walsh and

Table 1. Retention times (min-

utes) for target analytes on ana-

Ranney 1998). Retention times for the target analytes

lytical and confirmation col-

are presented in Table 1.

umns.

Because some of the analytes were present at con-

centrations that saturated the ECD, all samples were

RTX-5

RTX-225

also analyzed by RP-HPLC using a 15-cm by 3.9-mm

1.5 m

0.1 m

Analyte

(4-m) Nova Pak C8 (Waters Millipore) column eluted

0.925

0.337

with 1.4 mL/min 15:85 isopropanol:water. Absorbance

o-NT

1.409

0.416

was recorded at 254 nm on a Spectra Physics Spectra

m-NT

1.740

0.500

100 variable wavelength UV detector. For further con-

p-NT

1.920

0.564

3.761

4.432

firmation of analyte identity, some samples were also

1,3-DNB

4.746

3.792

analyzed on an HPLC equipped with a Waters 996

2,6-DNT

4.909

3.460

Photodiode Array detector, a Waters 616 pump, and a

2,4-DNT

5.736

4.470

Supelco LC-18 column eluted with 1.2 mL/min 60:40

TNB

7.542

7.987

methanolwater.

2,4,6-TNT

7.690

7.540

RDX

9.335

11.595

4-Am-DNT

9.956

10.582

RESULTS AND DISCUSSION

2-Am-DNT

10.418

11.058

Tetryl

11.322

11.595

Analytical results from Camp Ethan Allen

HMX

15.629

experiment--81-mm mortar rounds

RTX-5: oven program 100C for 2 min-

detonated with C4

utes, to 250C at 10/min and held 3

Results from the analysis of the snow samples from

minutes; injector 250C; detector

280C.

the first mortar round detonation at Camp Ethan Allen

are presented in Table 2a. Four explosives-related anal-

RTX-225: oven program: 100C for 2

minutes, to 210C at 10/min and held

ytes were detected: RDX, HMX, NG, and TNT. Sur-

5 minutes; injector 200C; detector

face concentrations of these compounds ranged from

210C.

Table 2. Masses of the various explosives identified in residues from the

81-mm mortar rounds detonated with C4 at Camp Ethan Allen, Vermont.

a. Detonation number 1.

Sample

M1-S5

M1-S4

M1-S3

M1-S2

M1-S1

Distance from crater (m)

4.25.0

9.911.4

15.116.6

20.822.1

25.328.4

Area sampled (m2)

1.16

4.65

9.29

Analytes detected:

RDX

Mass-aqueous (g)

13.7

23.5

18.3

5.9

9.7

Mass-soot (g)

0.7

0.6

1.6

1.4

0.02

Mass-total (g)

14.4

24.1

19.9

7.3

9.7

Concentration (g/m2)

12.4

5.2

4.3

1.6

1.0

HMX

Mass-aqueous (g)

2.0

4.2

2.0

1.6

1.4

Mass-soot (g)

<d*

Mass-total (g)

2.0

4.2

2.0

1.6

1.4

Concentration (g/m2)

1.8

0.9

0.4

0.3

0.1

Mass-aqueous (g)

730

2780

1500

360

1150

Mass-soot (g)

202

4320

205

195

1.1

Mass-total (g)

932

7100

1710

555

1150

Concentration (g/m2)

802

1530

367

119

124

TNT

Mass-aqueous (g)

0.06

0.23

Mass-soot (g)

Mass-total (g)

0.06

0.23

Concentration (g/m2)

0.05

* Below detection.

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