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could negative ions be produced by bombardment process in mass spectrometry?
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I have 1 gram of Diphenylamine and want to make a 10,000 or 1000 ppm solution in methanol. How do I make this?
Many times I don't got a caffeine peak in calibration of hplc using guard column ❓
why KF factor is between 4.5 to 7.5 mg/ml ? why ? why sometime pyridine is used in analysis like in raw material solvent like acetone etc?
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In standard weight box used for calibration of analytical balance there are two numbers (Qty) of 20mg, 200mg,2.oGM weights. Why?
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column washing procedure for normal phase and reverse phase?
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Why triethylamine and o-phosphoric acid used while setting pH of mobile phase during HPLC Analysis?
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Organic Chemistry 
