how to select short coloum and long coloumn for new molecule

2358

in hplc chromatogram started from left to right and in uv spectrum started from left to right

891

My 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

1549

CAN WE DETERMINE THE PEAK PURITY IN GAS CHROMATOGRAPHY ANALYSIS?

1152

Related substance method equivalency on control sample or spiked sample?

715

We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy

1836

How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

3156

What is the principle of Thermal conductivity detector and FID?

2683

Difference between the quantitative analysis and qualitative analysis?

1107

if your product is soluble in 0.1n hcl and water then which you choose as media from these 2 media?

634

In Dissolution Test why limit is define Q+5% what is the role of +5%.

3047

iam usig ph buffers merk. manually how to prepare ?

2226

Why we used in n-butyl acetate water content terminology while in ethyl acetate we used moisture content terminology?

1799

mode of absorption in alimentary canal?

2342

how you confirm the assay method?

727