How accurate is residue tests for explosives and how can I find results?
826018
It just so happens that I am working on developing a test method for explosives.  The results are as accurate as any other analytical method.  If you have samples that need to be tested you can try any environmental testing laboratory.  Send me a message at steve.rocks@yahoo.com
567188
Wow it is scary reading some of these answers... Take it to a reputable jeweler in your town and they will test it using  a touchstone and several different types of nitric acid to test. If this is done wrong you could ruin your piece of jewelry.... fire is certainly not your answer... gold meltsssssssssssss..most jewelers and I mean jewelers can tell just by looking, though sometimes even they need to test a piece...
488364
Chemexper.com its super cool , type in the name of the compound and it will give you a ton of info about the thing you are looking at. I order chemicals off of it but it was really useful in researching for my Ochem labs as well.
1128471
http://www.frontpagemag.com/Articles/ReadArticle.asp?ID=23059\n\nhow did we get ripped off?  read the entire article.  some is degraded but binary sarin shells don't degrade.   bottom line is it doesn't matter whether the stuff is useful today, it proves that in fact Bush DID NOT LIE about WMD's and Saddam obviously was being deceptive with inspectors by burying at least what has been found and certainly there is more.  There is strong evidence that much was moved to Syria also.
1170877
There have been no reports of this product causing a false positive drug screen.\n\nDrug screening processes have grown more sophisticated. They don't test for remnants of chemical byproducts in the system anymore. They now test for traces of the drug itself. We get people in our police dept all the time who fail a drug test but say "I just took some Sudafed." The response is "Cool. We don't test for Sudafed. We test for methamphetamine. You failed."
425447
The butllets yes, the cardridges more than likely. I doubt the powder would have decayed significantly.
241493
Very easy, in a lot of different categories. There is no regulation whatsoever on the quality of information posted, or content. Medical information can be incorrect or anecdotal leading someone to do damage to themselves. Information on such things a making explosives often leave out very important safety instructions( not that making a bomb is ever safe). And all of it is a click away, to anyone of any educational background or age.
717107
Titles of Investigation Reports which have produced high marks.\n\n     1 The factors causing variation in the attenuation of perspex.\n     \n     2 Flow of water over notches and weirs.\n     \n     3 Contraction of adjacent turns of a coil due to current through\n     them.\n     \n     4 Investigation of factors involved in flow of powders and\n     crystals.\n     \n     5 Investigation of light from a 1.5 V bulb and relative amounts\n     light of different wavelength from it.\n     \n     6 Load/speed variation of parachutes.\n     \n     7 Study of splashes.\n     \n     8 Behaviour of thyratrons under varying conditions.\n     \n     9 Corona discharge.\n     \n     10 Forced convection.\n     \n     11 Fibreglass joints.\n     \n     12 Araldite bonds.\n     \n     13 Audio percussion induced vibrations in metal rod.\n     \n     14 Creep in copper wire.\n     \n     15 Effect of shelving on breaking of waves.\n     \n     16 Strengthening of ice by sawdust.\n     \n     17 Aerodynamic forces on a motor car.\n     \n     18 A liquid flow meter.\n     \n     19 Piezo electric effect.\n     \n     20 Use of eddy currents for >n-destructive testing.\n     \n     21 A wind powered generator.\n     \n     22 The formation of a water tornado.\n     \n     23 Electrostatic particle precipitation.\n     \n     24 Water impact with a plane surface of water.\n     \n     25 Distribution of air-borne pollution.\n     \n     26 An electrical analogue for water flow through locks.\n     \n     27 Pouring - factors making the ideal spout.\n     \n     28 Construction and use of a variable-interval coincidence counter\n     for study of short-lived isotopes in a radioactive decay.\n     \n     29 Factors which might be involved in the hanging of a chain of\n     uniform mass/unit length.\n     \n     30 Smoke rings.\n     \n     31 The effect of different periods of short-circuiting on the rate\n     of recovery of a dry cell.\n     \n     32 Pressure/volume relationship of a rubber balloon.\n     \n     33 Behaviour of drops on a hot plate.\n     \n     34 Feasibility of solar energy.\n     \n     35 Optimum aperture of a pin-hole camera\n     \n     36 Absorption of microwaves.\n     \n     37 A study and analysis-of rotational vortices.\n     \n     38 The control of sound in rooms.\n     \n     39 The effect of internal pressure on the performance of a\n     football.\n     \n     40 Conductivity of electrolytes in wood.\n     \n     41 Absorption of liquids by filter paper.\n     \n     42 Shapes of water columns flowing from tops.\n     \n     43 Shaded magnetic probes.\n     \n     44 Ionisation of air and van de Graff generators.\n     \n     45 Design of an automatically operating burette.\n     \n     46 Use of a photo-sensitive device as a photometer and application\n     to light emitted from a light bulb.\n     \n     47 Energy stored in a clock spring.\n     \n     48 Investigation of cling wrapping: Why does it cling?\n     \n     49 The production of a pump using the movement of ions in a\n     magnetic field.\n     \n     50 Magnetic suspension.\n     \n     51 Temperature in a flame.\n     \n     52 Absorption of electromagnetic waves by glass,\n     \n     53 Motor and dynamo effects on conducting liquids.\n     \n     54 The sound of sea as heard in sea shell Is.\n     \n     55 Performance of a fan\n     \n     56 Lightening valve rocker arms to improve engine performance.\n     \n     57 Phase change in an induction motor.\n     \n     58 Fringes in draining soap Films.\n     \n     59 Heat pulse in a rod\n     \n     60 Hovercraft.\n     \n     61 Properties of foam plastic.\n     \n     62 The singing of a kettle.\n     \n     63 Acoustics of a large room\n     \n     64 Relationship between the wavelength and changing concentration\n     in a fluoresrcent substance\n     \n     65 Rotating shafts.\n     \n     66 Craters.\n     \n     67 @king an accelerometer.\n     \n     68 The shape of a drop.\n
586389
I use to work in IRAQ as a Contractor Engineer for Haliburton and have seen the destruction and loss of life because of roadside bombs first hand. This is a very good question. However, there are multiple answers primarily because there are many types of IED's (Imprevised Explosive Devices) being used for roadside bombs.\n\nEach type of bomb can be made of different explosive material (dynamite, C-4, fertiiizer, gasoline, etc.). the explosive material is covered with nails, metal shavings, BB's, bits of broken glass, and anything else they can scavange to cause death. In addition, there are many types of triggering devices used to detonate the bombs (electronic, mechanical clocks, fuse, impact/contact, etc.)\n\nNow to answer your question a scanning camera can be used but it is just that - a scanning camera. These cameras only give you a visual of an object. While on a convoy to transport food, water, medicine, fuel, war materials or people, the roads from the green zone (safe area) to the red zones (anywhere outside the green zone) are very long and are used by regular Iraqi citizens. You can't tell whou is a friendly and who is an insurgent. You don't know if a person is bending over to tighten the foot strap on his sandal or placing a bomb. A bomb can be placed there one day and removed the next. They (the insurgents) don't know when our convoy's are going to run, but they do know the major raods we use. \n\nDuring the war we bombed the hell out of towns and roads. These roads are littered with all kinds of debris, large stones, metal objects, tires, used water cans, wooden crates, abandoned cars, trash piles, and thousands upon thousands of tiny sand mounds. If we were to use a scanning camera we would get just a visual of the object. In order to detect the material within the object requires a special camera with special equpiment to find the explosive material. The problem here is that different cameras are needed for different types of explosve material.\n\nTo find IED's a humvey would have to loaded with thirty different types of cameras and detection equipment, each with their own power source. Each vehicle of this type woud cost about a million dollars per vehicle. Even then the success rate would only be about 20 - 40 percent accurate. Sand storms happen all the time (day and night) and come up out of nowhere. These storms impair the vision of the cameras making them even less effective. Using infra red doesn't work because most of the IED's used don't have a heat pattern, and the heat generated by the triggering device is the same size as sand bugs or beatles commonly found in the desert. There are millions and millions of these. \n\nIRAQ has thousands of roads we use and the cost would be prohibitive. In addition, this vehicle would inevatibly have to be the point vehicle in the convoy, and searching for IED's is a very, very, very slow process. This makes this vehicle a prime target for a low tech bomb (fertilizer and ammonia), a RPG, or snipper attack. Once this vehicle was taken out by the insurgents the rest of the convoy would be sitting ducks. This is why you see on the news that convoys are driving down roads at an accelerated speed hopping to drive past the IED's before they explode.\n\nFor the remote controlled IED's some (not all)our vehicles do have RF (radio frequencey) jamming devices to scramble the signal used by the insurgents to remotely trigger the device. But because these are typical garage door type triggers, there are thousands of frequencies and sub-frequencies that can be used. On a daily basis the Army Corp of Engineers does a RF signal sweep using a specrtun analyzer to determine which frequencies are in use, and we tune our jamming equipment to those range of frequencies. This kind of works but it doesn't work against triggers that use cell phones, fuses, or impact triggers.\n\nTo make things more complicated Iraq is a very large co
23146
If you know the compounds you tested you could always try a MSDS (Material saftey data sheet). This will tell you the lethal dose of the chemicals but you must be more specific than oil and grease. There are many different forms of petroleum and hydrocarbons.
569779
First think TRAPS.  A much safer alternative.  If you are bound and determined to try to blow the little buggers to kindom come be sure to take heed of the following recommendations:\n\nSince I do not know the state in which you live, I would recommend that you first check the laws covering the use of explosives in your state.  BATF is very concerned about who uses explosives for what purpose.  Once you have complied with all applicable laws so that you do not end up making license plates instead of farming, you can then obtain and use dynamite or black powder.  I am a muzzleloader shooter and it is not all that difficult to buy black powder.  It is available in some sporting goods stores for use as a propellent in a gun.  Once you have obtained the necessary explosives, you had better make sure that you know what you are doing or both you and Mr. groundhog will end up in the harp choir or you could be seriously injured.  Perhaps the better thing to do would be to simply hire an exterminator to remove the varmints.
764277
during and distructive test, danger exists. knowlege of the equiptment and proceedures are a must. if the exact failure point is to be measured, then at yield the test should be slowed. It will also minimise flying samples.
1005673
test tube- observing for chemical reations
878037
Suspect this is what you mean...\n\nSuppose you have 0.500 g of a substance you believe is pure...\nyou analyse it and determine that it contains 0.300 g of the substance you are looking for..\nso your sample is (0.300/0.500) x 100% pure  = 60%
700411
Fireworks are not true explosives.  They deflagrate rather than detonate.  The stars just burn.\n\nSome examples:\nFlash Powder\nBlackpowder of varying formulas and grain sizes.\nKP\nWhistle Mix
379015
Inorganic substance assay can be find out by dissolving it in HCl.Take 2gm substance in a crucible and add 20ml 10% HCl and boil for 2 min. Cool and filter it through ash less whatman filter paper.Wash the residue by distilled water.Place the filter paper in pre weighed crucible and place it in muffle furnace at 800*c for 2 hrs. cool and weigh the crucible and calculate the assay.
462356
It probably requires a mass spec technique.  Infrared might work.  Your detection level will be the problem.