What is possible cause of %rsd failure in GC Head space chromatography in six replicate standard solution??

13 March 2024 1 9K Report

% rsd fail down 10%limit

Rod's law - the more you don't tell me the more I can't help you. Your question tells me nothing. Revise it; tell us what you are doing, instrument and conditions, how you calculated your results and why you think exceeding 10% RSD is a failure.

More Shivaya shambhu Shiv's questions See All

Why uwb antenna group delay measurements taken at 30 cm?

UWB Antennas group delay measurements are carried by keeping antenna separated by 30 cm ftf or e2e configuration. The literature survey reveals it to be the abeyance of far-field condition.......

02 September 2020 6,404 3 View

Why don't we consider the biological properties for soil quality index computation?

There are several methodologies and quality publications available regarding on soil quality index but they have not considered the soil biochemical properties. Please let me know the scientific...

30 August 2020 1,970 37 View

How much time normal urea and neem coated urea prills will take to dissolve in distilled water? Will it transform to other form or not?

Urea being water soluble fertilizer is tend to dissolve rapidly in water than urea prills with any protective coating. Hydrolysis of water urea prills application in soil make available for plant...

12 August 2020 9,205 11 View

What is the difference between systematic review and meta analysis ? How to do meta-analysis ?

Nowadays, meta analysis is being widely preferably used for review paper writing. Is this meta analysis having edge over systematic review articles? Is there any specific software or methodology...

07 July 2020 3,172 14 View

Can we get mode II SIFs (KII) for the pure mode I loading in 3D analysis of an edge cracked plate?

I am performing a 3D analysis of an edge cracked plate with a straight fronted crack under pure mode I loading in ANSYS APDL. And I am plotting the variation of SIFs along the crack front in the...

28 February 2020 5,827 2 View

How many components are must to include for soil quality index analysis ?

As soil quality represent it's "fitness to use" or "capacity of soil to function to sustain productivity maintaining environmental quality and improved health". What are the basic components...

14 February 2020 7,210 6 View

Can we plot the Van Krevelen diagram simply with the help of excel or any specific software will be required ?

Please suggest if any specific software is used.

31 January 2020 6,189 3 View

Does Mean Residence Time (MRT) and Elemental Ratio give better understanding about Biochar Carbon stability?

As MRT express the decay rate (average time that biochar can persist from decaying) and this rate decreases with time. Therefore, the incubation period becomes pivotal for the MRT calculation...

11 January 2020 6,697 3 View

Why the phosphorus release varies from activated sludge by adjusted to pH 5 with hydrochloric acid and pH adjusted with bubbling with air?

Phosphorus release higher when pH adjusted with HCl acid at pH5 but Phosphorus release less when pH adjusted with bubbling air though the pH5.

19 September 2019 1,251 5 View

Can Vienna Ab initio simulation be used in windows?

working on theoretical work.

15 March 2018 8,285 2 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

How optimize the Size Exclusion Chromatography?

Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

01 March 2021 2,215 2 View

Precipitate after adding laemmli buffer to protein solution containing Potassium Acetate?

Hi, I am running a size exclusion chromatography experiment with a buffer containing Potassium Acetate as a salt. I analyse these fractions through SDS-PAGE. After boiling my SEC fractions in...

01 March 2021 2,622 3 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

Necessary tube lenght to cool Natural gas in a dry-ice cooling bath?

I have a tank which contains natural gas at 250 Bar and 293 Kelvin. I want to cool the gas in a dry-ice cooling bath to about 195 Kelvin. The gas will flow in a copper-tube through the bath with a...

27 February 2021 8,128 1 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 3 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View

Why do the air flow results vary totally when adding scalar in CFD ?

Dear All, We are using Autodesk cfd to calculate the air flow in a single sided naturally ventilated room, where air flow depends only on buoyancy due to temperature difference between inside and...

25 February 2021 9,602 4 View

Do you kow of any database containing data on retention time, log P and polarizability for a large number of molecules?

Hi, I am a chemistry undergraduate doing my dissertation project on HPLC. In my project, I need to predict the HPLC retention time of 20 aromatic molecules, the calibration set. To do this I will...

24 February 2021 2,602 1 View