Analytical Chemistry

Analytical chemistry is the study of the separation, identification, and quantification of the chemical components of natural and artificial... | Contact experts in Analytical Chemistry to get answers

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Questions related to Analytical Chemistry

Why am I getting negative intensities for my MP-AES analysis?

I am attempting to quantify total arsenic content in my L. sativum (garden cress) digests via hydride generation MP-AES (HG-MP-AES), however, for all my samples I receive negative intensity...

08 August 2019 6,991 7 View

What are a new protocols in lipid biochemistry?

Dear colleagues; What are the novel and accurate methods for testing the following: Total cholesterol conc. Triglycerides conc. HDL-C conc. LDL-C & VLDL-C Lipid peroxidation marker...

08 August 2019 1,457 8 View

How to identify the sources of enzymes in analytical chemistry of biological processes in human?

Presence and quantification of enzymes is possible but source determining is difficult as source may be microbial/ viral/ healthy or diseased tissue

08 August 2019 1,975 4 View

What are a new protocols in lipid biochemistry?

Dear colleagues; What are the novel and accurate methods for testing the following: Total cholesterol conc. Triglycerides conc. HDL-C conc. LDL-C & VLDL-C Lipid peroxidation marker...

07 August 2019 8,284 6 View

How to identify the sources of enzymes in analytical chemistry of biological processes in human?

Presence and quantification of enzymes is possible but source determining is difficult as source may be microbial/ viral/ healthy or diseased tissue

07 August 2019 1,195 4 View

How can I isolate N-hydroxyphthalimide(NHPI) from the reaction mixture?

In the reaction I used hydrazine hydrate in methanol solution.

13 July 2019 6,660 0 View

Orthophosphate concentrations are higher than total phosphorus. How can that happen?

The issue is that for many fresh water samples (not all) orthophosphate concentrations are slightly (for some samples more than slightly) higher than total P. For sample preservation I'm using...

09 July 2019 7,044 7 View

What is the best search engine you know for academy ?

Hello I'm only using scopus and google scholar for academic searches In your opinion what is a better search engine or library with better search and filtering options for more productive...

07 July 2019 9,578 5 View

absorption rate of aluminum and alumina?

How much is the absorption rate of aluminum and alumina (the oxide layer that forms on aluminum) for the radiation of the Nd-YAG laser (wavelength of 1.064 μm)?

07 July 2019 9,379 2 View

How can I do TGA analysis of polyurethane foam samples avoiding instrument contamination?

Dear researchers, please help me out in the following situation. I need to do TGA analysis of PUF (composition is castor oil/tdi/peg). The foam contains pure castor oil, which means that there is...

20 June 2019 3,628 5 View

How to improve the sensitivity and stability of uranium in TQ ICP-MS? It was observed that U <In counts for the same concentration, Why?

A strange fact has been noticed in an ICP-MS instrument equipped with triple quadrupole: After the performance check (interface check), the uranium (238 isotope) counts have been consistently...

06 June 2019 8,503 5 View

In free-flow electrophoresis tray is it necessary that the electrodes be in touch with liquids (buffers) or can they be designed behind the chamber?

I am going to fabricate a free flow electrophoresis (FFE) chamber. The chamber will contains the sample plus buffers (electrolytes). In capillary electrophoresis, IEF or gel-based electrophoresis...

06 June 2019 6,852 4 View

How can standard reference materials be prepared?

I want to know if I can prepare a standard solution with uncertainty equals to zero.

05 May 2019 3,313 5 View

Relative Response Factor Based On Internal Standard?

Dear to whom it may concern, I have just read the application of the relative response factor based on internal standard in analytical chemistry. I am much interested in this factoc. However, I...

05 May 2019 863 7 View

What are the principles behind some techniques in chemical separation?

What are the principles of process for the following techniques in chemical separation: Sublimation, Evaporation, Decantation, Filtration, Precipitation and Crystallization? Thank you

04 April 2019 9,964 6 View

What is the result of alum reaction with poly aluminium chloride?

I have added some PAC to 20% alum solution and a white sediment was formed. any idea what is that sediment?

04 April 2019 427 3 View

Why the peaks on chromatogram are moved a lot to the right?

What do you believe when the peaks on chromatogram are moved a lot to the right while the previous day were okay? For example my first peak was at 4.4 min and today is at 11.2 min. We have HPLC...

04 April 2019 5,731 27 View

Why have I failed to synthesize my 1,2‐diacyl‐sn‐glycero‐3‐phosphocholine ?

Hello, I've used the procedure proposed by Marrapu et al. (2015) --> A novel method to synthesize 1-acyl-sn-glycero-3-phosphochol... To synthesize di-C:8, di-C:12 and di-C:18...

04 April 2019 1,358 4 View

Why the peaks on chromatogram are moved a lot to the right?

What do you believe when the peaks on chromatogram are moved a lot to the right while the previous day were okay? For example my first peak was at 4.4 min and today is at 11.2 min. We have HPLC...

04 April 2019 6,414 25 View

Why have I failed to synthesize my 1,2‐diacyl‐sn‐glycero‐3‐phosphocholine ?

Hello, I've used the procedure proposed by Marrapu et al. (2015) --> A novel method to synthesize 1-acyl-sn-glycero-3-phosphochol... To synthesize di-C:8, di-C:12 and di-C:18...

03 April 2019 3,862 3 View

Calculating acetate concentrations in artificial wastewater?

Hi all, it maybe a very basic question of analytical chemistry but my background is microbiology so I am not sure how can i do that. Basically, I am using artificial wastewater in constructed...

26 March 2019 1,635 6 View

Calculating acetate concentrations in artificial wastewater?

Hi all, it maybe a very basic question of analytical chemistry but my background is microbiology so I am not sure how can i do that. Basically, I am using artificial wastewater in constructed...

03 March 2019 4,689 6 View

HPLC Thermo Scientific Dionex UltiMate 3000 pressure problem when adding water to the mobile phase?

Hello, We have HPLC Thermo Scientific Dionex UltiMate 3000 the problem is that the pressure becomes very high (approximately 200 bar) when we use the isoctratic mode using the analogy H20:MeOH...

20 February 2019 7,343 10 View

How can I measure Free Ag+ and free Cu2+ ions in solution?

I would like to know how much ions are available for reaction excluding any complexes. I am looking for free ions, Not dissolved copper or silver (which we can measure by ICP-MS).

13 February 2019 9,125 10 View

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