Anal. Chem. 1984, 5 6 , 1030-1033
1030
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L
L
I
I
50
I 150 TEMPERATURE
100
I 10
I 20
I 30 TIME (mln)
I
I
265
200
(‘C) I 40
I 50
I
60
Flgure 4. NPD capillary gas chromatogram of PFP derivatives of reduced nitro-PAC (Fraction 25-2)isolated from a diesel exhaust particulate extract. Conditions: 15 m X 0.2 mm i.d. fused silica capillary column coated with SE-54 (cross linked with ATB). Identifications o f numbered peaks are listed in Table 11.
ACKNOWLEDGMENT The authors thank T. E. Jensen and D. Schuetzle of Ford Motor Co. for generously providing the diesel sample used in this study.
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RECEIVED for review November 29,1983. Accepted February 1, 1984.
CORRESPONDENCE Solid Surface Room-Temperature Phosphorescence of Pesticides Sir: Room-temperature phosphorescence (RTP) is a recent advance in phosphorimetry and a rapidly developing new analytical technique (1-9). This new method revolutionized phosphorimetry,conventionally done at 77 K (LTP), by saving analytical time which was spent on cryogenic techniques (IO). RTP has been used in pesticide determinations by Aaron and Winefordner (11),who reported absolute limits of detection of naphthalene-like pesticides in the nanogram range. Some pesticides have been studied by the classical LTP method (12). The analysis of pesticides to monitor and regulate their
usage on crops is of interest to agencies like the U.S. Food and Drug Administration. The pesticides (carbaryl, carbophenothion, coumaphos, and coroxon (13) and 2-aminobenzimidiazole, benomyl, alanap, alanap sodium salt, asulam, devrinol, dexon, diphenylamine, diquat, paraquat, mobam, morestan, phenmidepham, pyrolan, and warfarin (14))reported in this paper each have methods of analysis used to enforce the Food, Drug, and Cosmetic Act. These methods use gas chromatography, liquid chromatography, and spectrophotometric detection techniques. Some methods are long
0003-2700/84/0356-1030$01.50/0@ 1984 American Chemical Society
ANALYTICAL CHEMISTRY, VOL. 56, NO. 6, MAY 1984
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Table I. RTP Response on Whatman No. 4 2 Paper as a Function of Surface Treatment and Solvent surface treatmenta ~
pesticide
untreated
acetate
alanap alanap sodium salt asulam 2-aminobenzimidazole benomyl carbaryld co roxo n coumaphos devrinol diphenylamine mobam morestand warfarin carb op he no t hio n diquat paraquat phenmedipham pyrolan
iodide
lead
thallium
acetate/ iodideb
~~
hydroxide/ iodideC
*r
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f , +, + + , +, +
+,+,+, +,-
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*r
*r
*
*, * *, *, +
*, *, +
*, * , e *
*, * , e
*
+, *, + + , *, +
f , *, f +, *, + *, *, + *, *, +
* * * , * ,* , * >9
*, *, + *, +, + *, *, *
,
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,
,
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I
,
I
,
1
_ ,_ ,_ , - I_
-, + , -, + , -, f , -, + , -, + , +,-, + , -, +,-, + > -, + , a Each column contains three entries for the following solvent systems, left to right: acetonitrile, basic methanol, and acidic methanol. Responses are given as strong (*), > 25x blank; moderate (+), >2x blank; negligible (0),
