References
(2) ASTM D19 Committee, "New Stan dard Practice for Preparation of Sample for Identification of Waterborne Oils", ASTM Method D3326 (Revised), P a r t 31, ASTM Annual Standards, 1978. (3) G. M. Frame, G. A. Flanigan, and C. P. Chamberlain, "Cleanup Procedure for Contaminated Oils Prior to Fingerprint ing by GC and IR Spectroscopy", 1978 Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, Abstracts, Paper 554, Mar. 1978. (4) J. W. Frankenfeld, "Weathering of Oil at Sea", Final Report, U.S. Coast Guard Contract DOT-CG-23035-A, N T I S Ac cession No. AD787789, Sept. 1973. (5) C. W. Brown, P. F. Lynch, and M. Ahmadjian, "Identification of Oil Slicks by Infrared Spectroscopy", Final Report, U.S. Coast Guard Contract DOT-CG81-74-1099, N T I S Accession No. ADA040975, Aug. 1976. (6) G. A. Flanigan, "Ratioing Methods Ap plied to GC Data for Oil Identification", Proceedings of Workshop on P a t t e r n Recognition Applied to Oil Identifica tion, Coronado, Calif., Nov. 1976, P u b lished by I E E E 1977, Cat No. 76CH1247-6C. (7) C. P. Anderson, T. J. Killeen, and A. P. Bentz, "Weighting Factors for Infrared Data Points in Pattern Recognition for Oil Identification", 1978 Pittsburgh Con ference on Analytical Chemistry and Ap plied Spectroscopy, Abstracts, Paper 397, Mar. 1978.
(1) U.S. Coast Guard, Dept. of Transpor tation, "Polluting Incidents in and Around U.S. Waters, Calendar Year 1976", CG-487, 6 Dec. 1977.
The opinions or assertions contained herein are the private ones of the writer and are not to be construed as official or reflecting the views of the Commandant or the Coast Guard at large.
Χ = SUSPECT S = SIMULATED Y = SPILL
NO. 6
FUEL
WX
OIL
WAVENUMBER CRECIPROCAL CENTIMETERSD Figure 5. Computer plot of normalized absorbances for 18 data points taken in oil spectra Plot shows differences between unweathered oil (suspect "X") and weathered oil (spill "Y"). It also shows how closely computer-simulated weathering of "X" lies relative to spill (curve "S"). Note that the simulation even shows slope reversal between 744 and 722 c m - 1
pled. It proved to be the same as the cargo of the Grand Zenith, the first concrete evidence of the location of that vessel's disappearance in the Jan uary storm.
3300 Series electronic balance $1395.00 Made in U.S.A.
Data Input Keyboard $250.00 Made in U.S.A.
THE INTELLIGENT ELECTRONIC BALANCE ...ONLY $1395.00
Scientech's new dual range toploader has built-in microprocessor controlled data handling capabilities. More than an electronic balance, Scientech's new 3300 Series is a data processing instrument that can be programmed to perform a wide range of complex weighing and data conversion functions . . . automatically, quickly and repetitively. An optional data input keyboard is used to pro gram the microprocessor "brain" in the balance, then the balance does the rest. The 3300 can store data, convert it from one unit to another, count parts and much more. A variable integration time feature assures accurate readings in hostile or un stable environments. And, since the balance does the "thinking", not the keyboard, one keyboard can serve many balances. Even if you don't presently need the data han dling capabilities of the 3300, you still get a fullfeatured toploader at a great price. For instance, BCD output is standard on the 3300. So is weigh ing in two ranges: 0-30.000g and 0-300.00g, instan taneous digital tare, clear LED display, all in a compact and attractive case. Only Scientech can offer you an intelligent bal ance with these features for $1395.00. Call or write for descriptive literature. For more information write or call
SCIENTECH, INC. 5649 Arapahoe Avenue • Boulder, Colorado 80303-303 444-1361
CIRCLE 190 ON READER SERVICE CARD 658 A · ANALYTICAL CHEMISTRY, VOL. 50, NO. 7, JUNE 1978
