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

Explain heat of combustion, Explain heat of Combustion? Ans) The amount ...

Explain heat of Combustion? Ans) The amount of heat liberated when single mole of any substance is completely burnt in oxygen is known as heat of combustion H is negative for he

Composition of the nucleus, Q. Composition of the nucleus Since the tim...

Q. Composition of the nucleus Since the time of Rutherford, other scientists have learned a significant amount about the fundamental properties about the nucleus of an atom. In

Explain sensory evaluation during product life cycle, Sensory evaluation du...

Sensory evaluation during product life cycle The basic procedure for developing a new  product, and supporting it while marketed, included distinct steps that are constant no

Rana, What is water?

What is water?

Where does the water present in the egg go after boiling it?, When an egg i...

When an egg is boiled, the proteins present inside the egg get denatured and coagulate. After boiling the egg, the water present in it is absorbed by the coagulated protein through

Wet test for inorganic salts, what is the basic radical for a salt having a...

what is the basic radical for a salt having a chlorine basic radical?

Catalytic activity of metalloenzymes, Q. Catalytic activity of metalloenzym...

Q. Catalytic activity of metalloenzymes? Catalytic activity of metalloenzymes depends on the complex form in ability of a particular metal ion. One specific example is carbonic

Perfumes - chemical in cosmetics, Perfumes: Perfumes are the matters, ...

Perfumes: Perfumes are the matters, utilized to provide fragrance. Several requirements must be fulfilled to make use of a good perfume and any material, that just offers good

Write Your Message!

Captcha
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!

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