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DEMETON

(C2H5O)2P(=S)O(CH2)2SC2H5 (1) (C2H5O)2P(=O)S(CH2)2SC2H5 (2)

MW: 258.34

METHOD: 5514, Issue 2

5514

CAS: 8065-48-3

EVALUATION: FULL

OSHA : 0.1 mg/m 3 (skin) NIOSH: 0.1 mg/m 3; Group I Pesticide ACGIH: 0.01 ppm (0.11 mg/m 3) (skin) (1 ppm = 10.56 mg/m 3 @ NTP)

PROPERTIES:

RTECS: TF3150000

Issue 1: 15 May 1985 Issue 2: 15 August 1994

liquid; d 1.18 g/mL @ 20 °C; BP 134 °C @ 270 kPa; MP -25 °C; VP 0.1 kPa (0.001 mm Hg; 1 ppm) @ 33 °C

SYNONYMS: phosphorothioic acid O,O-diethyl O-[2-(ethylthio)ethyl]ester (Demeton O)mixture with O,O-diethyl S-[2-(ethylthio)ethyl]phosphorothioate (Demeton S); Systox; Bayer 8169; Demox; mercaptophos SAMPLING

MEASUREMENT

SAMPLER:

FILTER + SORBENT TUBE (2-µm mixed cellulose ester + XAD-2, 150 mg/75 mg)

FLOW RATE:

0.2 to 1 L/min

VOL-MIN: -MAX:

30 L 500 L

SHIPMENT:

transfer filter and front sorbent section to same vial

SAMPLE STABILITY:

at least 7 days @ 25 °C [1]

FIELD BLANKS:

2 to 10 field blanks per set

TECHNIQUE:

GAS CHROMATOGRAPHY, PHOSPHORUS FPD

ANALYTE:

(1) Demeton O and (2) Demeton S

DESORPTION:

5 mL toluene, 15 min

INJECTION VOLUME:

5 µL

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN: CARRIER GAS:

N 2, 30 mL/min

COLUMN:

glass, 1.2 m x 3-mm OD; 1.5% OV-17/1.95% OV-210 on 100/120 mesh Chromosorb WHP

CALIBRATION:

solutions of Demeton in toluene

RANGE:

3 to 100 µg per sample

ACCURACY RANGE STUDIED:

0.03 to 0.19 mg/m 3 [1] (480-L samples)

BIAS:

0.49%

ˆ ): OVERALL PRECISION (S rT

0.03 [1]

ACCURACY:

± 13.9%

200 °C 210 °C 165 °C

ESTIMATED LOD: 0.1 µg per sample [1] PRECISION (Sr):

0.03 [1]

APPLICABILITY: The working range is 0.015 to 10 mg/m 3 for a 200-L air sample. The use of a capillary column, e.g., a DB-210, may improve sensitivity and resolution.

INTERFERENCES: None identified.

OTHER METHODS: This revises Method S280 [2].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94