S31VS cnvNoa
Have LC Lab, Will Travel Testing Propellant Stability after Operation Desert Storm At the conclusion of Operation Desert Storm, one of the problems facing the U.S. Navy was ensuring that unused propellant was safe to ship home after being in the Saudi Arabian desert. Modern gun p r o p e l l a n t s h a d never before been used u n d e r such severe desert conditions, and there was no way to predict how the propellant might have been affected. Furthermore, the war lasted 100 hours instead of the expected 100 days, and the majority of the gun ammunition sent to the Gulf was not used but instead was stored temporarily in ammunition dumps. Under normal conditions, the propellant would have been sent to the Naval Surface Warfare Center, Indian Head, MD, to determine the stabilizer content. However, Marine and Navy officials believed t h a t operational readiness would be jeopardized if the propellant were shipped back to the United States before it was tested.
This article not subject to U.S. copyright. Published 1992 American Chemical Society.
Gail Y. Stine Propellant Analysis Branch Indian Head Division, Naval Surface Warfare Center Indian Head, MD 20640
I had the opportunity last spring to spend 33 days in the desert analyzing gun propellant using a mobile LC laboratory. As manager of the Propellant Analysis Branch at the Naval Surface Warfare Center, I was given two months to design and implement
FOCUS FOCUS
Corps near Al Mishad, 60 miles south of the Kuwaiti border. Approximately 70% of the gun propellant that was not used during the war was unloaded there for testing, inventory, and shipment home. We needed to determine whether the propellant could be loaded onto Marine expeditionary ships bound for other missions, shipped home for further tests and storage, or destroyed on site. All instrumentation, equipment, and consumable supplies had to be purchased and shipped to the site within two months. Planning efforts revolved around the fact that there would be no opportunity to procure spare parts or supplies in that part of the world. In addition, instrumentation and supplies had to be packaged to sustain h a r s h shipping conditions. The crates of equipment remained on the tarmac at Dhahran airport for 10 days before being t r a n s p o r t e d by truck over unpaved roads 150 miles into the desert. The lab was set up in one half of a semitrailer equipped with electricity and an air conditioner. The Marines furnished a portable generator to provide electrical power. A fuel truck came by once a day (if we were lucky)
a mobile lab in the desert of Saudi Arabia. Together with I r m a DalCanton, a physical science technician, we decided w h a t resources would be needed for our journey to Saudi Arabia. Once there, we worked amid severe environmental conditions, including heat and blowing sand, and cultural restrictions against women that limited our freedom of movement. We set up the lab at an ammunition dump operated by the Marine ANALYTICAL CHEMISTRY, VOL. 64, NO. 7, APRIL 1, 1992 • 453 A
FOCUS
From Caveman to Chemist Circumstances and Achievements
W
hat was the connection between early chemistry and magic? What was the logic that made alchemists think they could make gold out of lead? Why were gases not recognized until the 17th century? Why did it take 49 years before Avogadro's hypoth esis was accepted? In From Caveman to Chemist author Hugh Salzberg traces the oddities of chemistry, ex amining cultural and political influences on the ideas of chemists. He follows the evolution of chemistry from the Stone Age beginnings of ceramics and metallurgy, through the rise and decline of alchemy, to the culmination of clas sical chemistry in the late 19th century. Chapters 1 through 9 lead from prehistoric technology, through ancient and medieval sci ence to the study of chemicals and reactions that resulted in the 16th century birth of sci entific chemistry. Subsequent chapters focus on key chemists such as Sala. Boyle. Black. La voisier. Dalton. Berzelius. Laurent, and Arrhenius as they developed the ideas that led to classical chemistry and the concepts of mole cules, chemical reactions, homology, valence, and molecular formulas and structures, among others. Twenty topical illustrations enhance the text. Six timelines and two maps help readers understand the influences of early history on chemistry. About the Author Hugh W. Salzberg taught chemistry at the City University of New York for 35 years and of fered courses in the history of chemistry over a period of 20 years. From Caveman to Chem ist reflects his dual passions for chemistry and history and his profound admiration of the great minds that developed the ideas of chemistry. Hugh W. Salzberg Editor 300 pages (1991) Clothbound: ISBN 0-8412-1786-6 $24.95 Paperbound: ISBN 0-8412-1787-4 $14.95 Ο · R · D · Ε · R
to refill the generator. A civilian car penter constructed lab benches, and we unpacked and set up the instru ments and equipment. The labora tory was operating within two days of the equipment's arrival at the am munition dump, and we experienced little downtime because of problems resulting from the h a r s h shipping conditions. The propellant analysis involved extraction with acetonitrile followed by filtration using 0.45-μηι filters and subsequent analysis by HPLC (see Anal. Chem. 1991, 63, 475 A). We used a Hewlett-Packard 1050 HPLC system equipped with a quaternary pump, autosampler, and UV detector set at 254 nm. An HP ChemStation was used for data processing and re port generation. Stabilizer and stabilizer degrada tion products were analyzed and to tal effective stabilizer determined for each propellant lot analyzed. Based on a comparison of initial stabilizer content and the history of the stabi lizer depletion rate for each lot, we were able to decide which lots should be destroyed and which were safe for shipment. Using an assembly line approach, we extracted and analyzed samples 12 hours a day, seven days a week. Unfortunately, the autosampler could not run unattended overnight because the generator and the fuel supplies were not reliable. Even with this limitation, during a four-week period, we analyzed 450 lots of gun propellant and determined that 15 had below acceptable levels of stabi lizer. These lots were destroyed.
C o n c u r r e n t with our chemical analysis, other members of the Na vy's gun propellant surveillance pro gram began to inventory and inspect the packaging conditions of the pro pellants shipped to the desert. Most of the 15 lots deemed unsafe for ship ping had damaged crates t h a t al lowed some propellants to be exposed to the environment. We thus concluded that the propel lant lots did not deteriorate as a re sult of harsh desert conditions unless the packaging container deteriorated or was broken. The propellent was stored in stacks on pallets in the open desert, without any shade or protection, for several months. Dur ing winter, t e m p e r a t u r e s r a n g e d from 40 °F at night to 70 °F during the day; during spring and summer, temperatures rose as high as 115 °F in the shade. We became concerned not so much about the short-term ef fects (because the data indicated that temperature was not a problem) but about the possible long-term effects of temperature cycling on propellant stability. All propellant stored in the desert has been marked so that it can be closely monitored during future stability testing. We have established a baseline for this monitoring as a result of our on-site desert tests. Although the environment did not substantially affect the propellent's stability, it did test the endurance of the analysts. The instrumentation was air-conditioned and resided in a reasonably sand-free environment. However, the lodging provided by the Marines posed a real challenge for two women civilians. We lived in a
F · R · Ο · M
American Chemical Society Distribution Office, Dept. 88 1155 Sixteenth St.. N.W. Washington. DC 20036 or CALL TOLL FREE
800-227-5558 (in Washington. P.C. 872-4363) and use your credit card!
Sleeping quarters during our stay in Saudi Arabia. The Marine encampment consisted of rows of tents with sand dunes bulldozed around them.
454 A • ANALYTICAL CHEMISTRY, VOL. 64, NO. 7, APRIL 1, 1992
tent in a temporary base camp where there were three women Marines and more than 200 male Marines. It was difficult to keep clean a n d wash clothes using bottled water. On most days the smoke from the burning Ku waiti oil fields blotted out the sun and kept temperatures down to 80 °F, a l t h o u g h d u r i n g d a y l i g h t hours it could get so dark from the smoke t h a t f l a s h l i g h t s were r e quired. When the wind shifted and the s u n came o u t , t e m p e r a t u r e s soared to above 115 °F. Dust storms occurred frequently and coated everything with a fine powder simi lar to talc, unlike the coarse sand to which most Americans are accus tomed. Not only were the flies tena cious, but occasionally scorpions, poi sonous spiders, and vipers tried to make their home in our belongings. Because of the cultural restrictions imposed on women, we were forbid den to drive or to be unescorted in public, and our clothing had to com pletely cover our arms and legs. We overcame these restrictions by wear ing Marine uniforms in public and prevailing upon the male Marines and civilians to act as our chauf feurs.
Under t h e h a r s h environmental conditions it was difficult to keep the sand out of the lab area. We vacu umed the computer every few hours in an effort to keep it clean. Sand clogged the LC pumps, and we faced the dilemma of whether to open the pumps to clean them, risking the in troduction of even more sand and grit. Brownouts were frequent, and the computer and the data station malfunctioned when temperatures inside the trailer reached 90 "P. It became imperative to learn how to operate and maintain the genera tor. T e m p e r a t u r e control was t h e g r e a t e s t problem. When t h e s u n came out from behind the smoke, it baked the metal trailer, and inside temperatures rose to close to 100 °F despite air conditioning. This prob lem was mitigated by using camou flage netting over the entire trailer and operating equipment during the coolest time of day. In the end we were able to analyze the propellant and enable the Ma r i n e s to load their expeditionary ships in record time. By employing a mobile lab in the desert, we proved that it is feasible to deploy a similar mobile lab elsewhere in the world.
We have designed a mobile lab that will begin operating in late spring. This lab will be used to test the stabil ity of gun propellents stored at various naval bases around the world. Results generated from this new facility will reduce military response times and lo gistical problems and at the same time increase the operational readi ness of our armed forces.
Gail Y. Stine is an analytical chemist for the Indian Head Division of the Naval Surface Warfare Center (NSWC) where she manages the Propellant Analysis Branch. She received an M.S. degree in analytical chemistry from Georgetown University and has been employed by the NSWC since 1985. She is currently devel oping new chromatographic methods and techniques to further characterize propellants and explosives.
The Best Instruments In The World for absolute macromolecular characterization.
UR DAWNK instruments will measure the absolute | molecular weight of your polymers directly and easily. Couple our systems to your existing GPC/SEC line and you'll be determining absolute ™ Call us at w weights, sizes and distributions without having to rely *• 805-963-5904 Mor FREE literature! on polymer standards, column calibration, "universal" constants, or flow rate effects. You can even determine branching ratios, molecular sizes, and conformations in minutes—without mak ing any assumptions. The DAWNs can also be used to observe polymerization and kinetics as they occur, or for immediate quality control "fingerprinting" of com plex polymer solutions. / / ^ ^ Λ ν Ν W W V o I* L Please contact us for a complete literature pack age. It won't take us long to delight you with the best CORPORATION 802 East Cota Street · Santa Barbara, CA 93103 service, support—and instruments—in the world!
O
Wyatt Technology Telephone: (805) 963-5904 · FAX (805) 965-4898
[ 1991. Wyatt Technology Corporation. All rights reserved.
Please visit us at FASEB Booth #2104 and ACS Booth #1425 CIRCLE 150 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 64, NO. 7, APRIL 1, 1992 • 455 A
