atomic absorption troublshouting, Chemistry

atomic absorption troublshouting, Chemistry

Assignment Help:

Dear sir,
We need your consultancy in a technical problem that we are confronting, and we would really appreciate your help
We are in the process of implementing the heavy metal analysis in fish and water by atomic atomic absorption spectroscopy,
I’m still in the sample preparation optimization phase, and I’m confronting some problems,

Il explain in brief the problem in my last results obtained:
For arsenic analysis, 0.2 g sample is digested with Nitric acid At 90?C for 45 min ,then placed in oven for 2 hours at 130 ?C, then diluted to desired volume

1- 0.2 g Unknown fish sample spiked with (2.5ml) 1000ppb arsenic standard, after dilution in 25 ml H2O,the theoretical value must be 100 ppb, but the practical value came out 75 ppb
2- 0.2 g Fish muscle certified reference material ,containing 12.7 mg/kg of arsenic, and since the dilution is in 50 ml, then the theoretical value must be 50.8 ppb, the practical value came out 0.57ppb

Knowing that both samples were treated in the same condition and in the same time, the difference in the end results is very weird, please advise concerning any note that can improve our work,
or detect any mistake has been made,
waiting for your reply,many thanks in advance

Related Discussions:- atomic absorption troublshouting

Octet rule, reasons of failure

reasons of failure

Metallurgical Processes, Metallurgical Rate Phenomena

Metallurgical Rate Phenomena

Organics, what are the different methods for purifying the organic compound...

what are the different methods for purifying the organic compounds with examples and applications on these methods in our daily lives or in industry?

Cis or trans isomers, which one is more stable cis or trans

which one is more stable cis or trans

Concentration of ion, How do i find the concentration of Cl- ion in 0.60 M ...

How do i find the concentration of Cl- ion in 0.60 M AlCl3 solution?

Alcohols, methods for preparing trihydric alcohols

methods for preparing trihydric alcohols

Analysis of oils and fats - acid value, Analysis of oils and fats - Acid va...

Analysis of oils and fats - Acid value It points out the amount of free acid present in the oil or fat. It is described as the number of milligrams of KOH needed to neutralize

Anamalous behaviour of lithium, why lithium is the strongest reducing agent...

why lithium is the strongest reducing agent in alkali metals

Crystal field theory, an elementary ideas of cft

an elementary ideas of cft

Acid and bases, How to find which compound is acid or basic. I need only a ...

How to find which compound is acid or basic. I need only a understanding or a basic tip or suggestin how to find whether a compound is an acid or base Ans) We can find a compound

Write Your Message!

Name

Email id

Message

Verfication Code

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd