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Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...
1690In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?
1973Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.
14291.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer
1852My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards
1596
What is the role of a catalyst? : Polymer Chemistry
why we shrink our body during cold
iam usig ph buffers merk. manually how to prepare ?
How are ph and pka related?
Why we have to add 200mg Na2CO3 in preparation of 0.1N sodium thiosulfate solution?
What are some common compounds or chemical reactions involving Protactinium, and how do they contribute to our understanding of this element?
Define Vulcanization?
process of Diclofenac sodium,IP.
Fresh form of water is obtained from?
why require to do water content for drug product?
Explain the process of protactinium-uranium fractionation and its implications for understanding geological and geochemical processes.
what kind of question can be asked in interview for UV- VISIBLE & give me answer ?
What kinds of structural changes accompany bond-breaking and bond-forming in olefin polymerization? : Polymer Chemistry
How require to develop GC method? how to select diluent, GAS, column selection and other chromatographic conditions?
why we need to synthesize impurities of midazolam
