Where can I send water samples in Mexico for testing?
You can have it tested at Intertek Testing Services de Mexico (Lab in Mexico City D.F.). The company lists rain water testing in the list of analysis services that are provided. You will need to contact the company for fees and instructions for preparing and submitting samples for testing. I have provided a link to the company website which lists contact information.http://www.astm.org/LABS/filtrex...
Chem lab question, please help!?
A 3.677 g sample of NaC2H3O2 x 3H2O is heated in a test tube until all of the water molecules are driven off. The NaC2H3O2 remaining in the test tube has a mass of 2.216 g. Determine the ratio of moles of water to moles of NaC2H3O2 in the original compound. Does your answer make sense knowing the chemical formula for the hydrated compound? Hears what I got: Moles of NaC2H3O2 left tin test tube: .0270 mol NaC2H302 Moles of H20 lost during heating: .0270 mol 3H20 Ratio of moles H20/ moles NaC2H302: .0270/.0270 And the last questions asks: Does this make sense? Why? I don't know if this is right. Please help. Anything would. Thanks!
What are the best testing Services in India?
There are many testing companies but my personal recommendation is only Testrig Technologies because we provide independent QA and Testing services .which is available to clients all across the world.from fortune 500 companies to small technology start-ups, more than 100 satisfied clients across the world from various industries.Why choose us as a Software Testing company for your project?Trial PeriodScalable dynamic teamEfficient CommunicationQA Test LabFlexible Engagement ModelNot stick with 8 hours. We work based on priority of customersTrained testing experts – so you discover quality problems before your customers doWork along with the development teamWorking in Customer’s TimezoneYou can also visit here: Testrig Technologies for compelte information...
What is the chemical test for hydrogen?
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If you test two samples and find that both produce a red flame....?
You could look at both samples through a diffraction grating. This will allow you to distinguish between separate lines in the spectrum. Perhaps both have a strong red line, but one has a weaker green line - this would indicate that they are different metals. In the second case, it is likely that all of the compound burned off (was vaporized). The yellow color could result from traces of sodium on the testing wire or the formation of carbon particles in the flame (the presence of the wire will cool that part of the flame and also provide a surface for soot to form on).
Why is it important to perform tests on a control urine sample not containing any chemical substance?
Controls are used to determine whether or not the newly introduced variable has actually had an effect. Though um, chemical substances ARE in urine, that phrase itself doesn't quite make sense. Example: You have a strip of paper. When placed in urine with no "chemical substrances" (this would be the control), the strip turns pink. When placed in urine with "chemical substrances", the strip turns pink. The fact that the strip turns pink indicates... nothing about whether or not the urine contains cheimical substrances. You have a different strip of paper. When placed in urine with no "chemical substrances" (control), the strip turns pink. When placed in urine with "chemical substrances", the strip does not turn pink. With the different results, we know that the color of the strip of paper once wet actually MEANS something. If no control sample was present, no test on the urine would be able to indicate anything. In most cases regarding common testing and products, long clinical studies involving controls are done before hand, so we know that the results of a test are relevant.
What are the parameters used in water quality testing?
There are 5 major categories of parameters used in water quality testing services : Physical & Chemical testing : Colour, Turbidity, pH, Total Dissolved Solids (TDS), Total hardness, Alkalinity, Chloride, Fluoride, Sulphate, Nitrate, Free Chlorine, Sulfide, Phenolic Compound, Anionic Detergents, Cyanide, etc. Toxic element testing : Iron (Fe), Calcium (Ca), Copper (Cu), Chromium (Cr), Manganese (Mn), Magnesium (Mg), Mercury (Hg), Cadmium (Cd), Molybdenum (Mo), Selenium (Se), Arsenic (As), Lead (Pb), Zinc (Zn), Aluminum (Al), Nickel (Ni), Boron, etc. Microbiology testing : E.coli bacteria, Total coliform bacteriaPesticides testing : Alachlor, Atrazine, Aldrin/Dieldrin, Alpha HCH, Beta HCH, Butachlor, Chlorpyrifos, Delta HCH, DDT, Endosulfan, etc. Volatile organic compound testing : Benzene, Toluene, o-xylene, m-xylene, p-xylene, Bromobenzene, n-butylbenzene, sec-butylbenzene, tert-butylbenzene, 2-chlorotoluene, 4-chlorotoluene, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, Ethylbenzene, Isopropylbenzene, n-propylbenzene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, etc. For more information you can visit : http://www.whaters.com/
Why is it important to perform tests in a control urine sample not containing any chemical substances?
It is all about quality control. Whenever QC is being run it is to make sure that the analyzer, etc is giving the correct results for a sample. I don't know if you are talking about like a urine control for drug screening, or something else. But a positive urine control must be run, and a negative control must be run also. If a positive control was only run then any patient samples that come up positive may actually be negative for a certain drug or drugs, for some reason. For example, if it was a kit test, it may have been the techs fault because they did not perform the procedure correctly, which will in turn give a false result. And how would you know if the result was correct or not if you did not run QC for a positive and a negative control. And when negative controls are run it ensures that any patients that truely have negative results are correct, and it makes sure that the reagents are working correctly. But if a positive and a negative control was run and both gave correct results then you would know that the analyzer, test kit, etc, was giving correct results. I don't know if this was what you were looking for, but I did my best to answer, I hope I didn't confuse you, hope this helped a little bit.
What is the cost of measuring and testing water quality?
You first need to determine what you want to test.If you are on municipal water, they are testing the water on a pre-determined frequency and they can give you the results. Many times you can find the results published online.If you are on well water, contact a local laboratory. They know what contaminants are specific to your local area. For example, in CT, we have very little arsenic, some radon, more nitrates (due to farming communities) and in some areas, MTBE due to old gas stations. The lab can help determine what tests you should purchase. Also, let them know if you have children because you may then include testing for lead and fluoride.