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Samples sometimes need to be diluted to bring their concentration within the range of the measurement method, to prevent interference or saturation of the detector, or to ensure that the sample is compatible with the analytical equipment being used. Dilution can also help reduce matrix effects and improve the accuracy of the analysis.
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What are the differences between seeded and unseeded BOD?
Seeded BOD involves adding a known quantity of acclimated microorganisms to the BOD sample to speed up the decomposition process. Unseeded BOD relies on the naturally occurring microorganisms in the sample to break down the organic matter, which can take longer compared to seeded BOD. Seeded BOD may provide a more accurate and consistent measure of the organic load in a sample, while unseeded BOD can be influenced by the initial microbial population present in the sample.
Why would a blood test need retaking?
A blood test may need to be retaken if the sample was compromised or hemolyzed during collection, if an error occurred in processing the sample, if the results were inconclusive or questionable, or if the healthcare provider suspects a potential issue with the initial test.
What is another word for specimen?
Sample, example.
What is the importance of a pour plate in microbiology?
A pour plate is important in microbiology because it allows for the isolation and quantification of microorganisms present in a sample. The pour plate method involves mixing the sample with agar and then pouring the mixture into a petri dish to solidify. Microorganisms will grow both on the surface and within the agar, enabling a more accurate count and isolation of individual colonies.
Will isolated colonies of bacteria always be in the fourth sector on the streak plate?
No, isolated colonies of bacteria may not always be in the fourth sector on the streak plate. The placement of isolated colonies can vary depending on factors such as the distribution of bacteria on the plate and the streaking technique used.
Can a lab read a diluted sample?
no i have personally done this every time i have taken a test and passed. but you can get in trouble for having a diluted sample.
Can diluted urine give a false negative?
If you deliver a diluted sample, they'll flunk you just for the dilution.
Is a diluted urine sample the same as a positive test?
sometimes!
What is a negative diluted urine sample?
A diluted urine drug test is one where the sample was diluted. It happens in two ways--you drank too much water to make yourself pee (DOT's standard says drink no more than 40 ounces of water), or you put water in your sample after you peed it out.A negative diluted test says "no drugs in this sample passed the test thresholds, but it was diluted so there MIGHT be drugs in here." Basically, a diluted negative is a test failure.
Would marijuana show up on a very diluted urine sample?
Nope!
Will the lab still test a very diluted sample and will cocaine still show up if it is diluted with lots of water?
It really depends on the amount of cocaine that was taken, and the strength of the test. If a lab test probably caught.
Can you combine a clean donors urine with your own diluted sample to pass a drug screen?
only if you are stupid enought to do that and risk jail
How many moles of Cu were in the original sample which had been effectively diluted to a volume of 200 m?
(0.102gx1mole)/99g CuCl = 1.031x10^-3 moles
Will isolated colonies always be in the second sector on the streak plate?
No. It depends on the number of bacteria present in the initial sample. If the number of bacteria in the initial sample are limited, you may get isolated colonies in the first streak. If the number of bacteria in the sample are high, it may take several streaks before the sample is diluted to the point where isolated colonies are evident.
I have been on fed probation for 3 years always complied what will happen if I miss a urine because im out of town he said the last one was diluted I did nothing different New po for last 3 weeks?
Get a lawyer. There is no way to determine in standard practices whether a sample is diluted or not. A full laboratory spectral analysis of the sample would need to be conducted, and this is neither cost effective nor judicially prudent without probable cause. Not to mention with current federal lab delays, it would take months for him to obtain the results.
How to calculate BOD value in a sample?
if unseeded, BOD = (D1-D2)/Pif seeded, BOD = ((D1-D2)-(B1-B2)f)/PD1 = DO of diluted seeded wastewaterD2 = DO of wastewater after incubationB1 = DO of diluted seed sampleB2 = DO of seed sample after incubationf = ratio of seed volume in seeded wastewater test to seed volume in BOD test on seedP = decimal fraction of wastewater sample used. (vol. of wastewater)/(vol. of dilution water plus wastewater)Maybe that helps
Why do you need to perform each of the tests on a known sample as well as on your unknown sample?
it is need so as a control.
