YELLOW RAIN-ANALYSIS EVALUATION OF REFERENCE RICE SAMPLES

• Document Type: FOIA
• Collection: FOIA Collection
• Document Number (FOIA) /ESDN (CREST): 00037501
• Release Decision: RIFPUB
• Original Classification: U
• Document Page Count: 2
• Document Creation Date: December 28, 2022
• Document Release Date: September 26, 2017
• Case Number: F-2012-01432
• Publication Date: September 27, 1984

Approved for Release: 2015/01/05 000037501
ANALYTICAL RESEARCH DIVISION .
RESEARCH DIRECTORATE
27 September 1984
Analysis/Evaluation of Reference Rice Samples
A shipment, designated 100271(4), also identified with 1A831204-808,
LA831202-908 and LA831207-1010, was received by the Analytical Research
Division, 11 January 1984, from FSTC. The shipment consisted of three
unmilled white rice samples (figure 1) reportedly collected from different
areas in Laos as uncontaminated control samples. Each sample was
containerized in a ziplock plastic bag.
A vapor sample withdrawn from within each plastic bag was subjected
to analysis by gas chromatograph/mass spectrometry (GC/MS). Portions of
each sample were leached in chloroform. Other portions of each sample
were leached in 1:1 methanol:water. The solvent solubles were analyzed by
GC/MS, ion chromatography (IC), thin layer chromatography (TLC) and infrared
spectrometry (IR).
100271(4)-1 (LA831204-8DB
The GC/NS spectra of the vapors associated with the sample identified only
traces of ethyl naphthalene. The GC/MS spectra of the chloroform solubles
detected traces of hydrocarbons from C28 to C32 and a possible trace of
rubber. IC and TLC were both negative. Derivatization/MS was negative for .
trichothecenes. IR spectra detected aliphatic hydrocarbons and a carbonyl
band at 1729 cm-1.
100271(4)-2 (LA831202-908)
The GC/115 analysis of the vapors associated with the sample gave no
definitive spectra. The GC/MS spectra of the chloroform solubles detected only
a possible trace of rubber. IC and TLC were both negative. Derivatization/-
MS was negative for trichothecenes. IR spectra identified aliphatic
hydrocarbons and a carbonyl band at 1732 cm-1.
100271(4)-3 (LA1207-1008)
The GC/MS analysis of both the vapor associated with the sample and the
chloroform solubles gave no definitive spectra. IC and TLC were negative.
Derivatization/MS was negative for trichothecenes. IR spectra identified
aliphatic hydrocarbons and a carbonyl band at 1730 cm-1.
Conclusion
No evidence of any known CW agent, agent degradation product or
trichothecene was detected. The samples each appeared completely innocuous
and excellent reference samples. The carbonyl detected in these samples
indicates the carbonyl detected in suspect samples could be from natural
sources.
Class 'ed b CIA
classi y:
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Approved for Release: 2015/01/05 000037501