chlorination of methane is possible and a mixture of products are obtained. Is flourination and Bromination of methane is possible?

1624

why salisylic acid not using now days for disdolution calibration?

309

How to synthesize methylene bisthiocyanate using CH2Cl2 and NaSCN?

2448

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

1121

Which is the highly polar and highly non polar column in HPLC?

1790

In HPLC Calibration, On which basis RSD Limit of noise test is fixed (NMT 33.0 % )

2965

What are filters? Why are they used?

605

1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer

1308

why in uv calibration in Limt of absorbance parameter specific absorbance is calculated only for selected wavelength

2205

What is the requirement to give RFlow when using RID detector?

2598

What is column in chromatography?

1767

Define dipole moment?

605

Comosition of bell metal

1311

WHAT IS THE PURPOSE WE USE HCL, CHOPPER, BURNER, MONOCHROMATOR in AAS? PLEASE EXPLAIN BRIEFLY

2112

how to calibrate hplc & gc

4037