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

Explain electrochemical series with its applications., We have seen that di...

We have seen that different metal/metal ion combinations have different values of electrode potentials. The various elements can be arranged in order of increasing or decreasing va

Priming and foaming, Q. Write short notes on priming and foaming. An...

Q. Write short notes on priming and foaming. Ans. Priming and foaming: When a boiler produces steam rapidly, some particles of the liquid water are carried along with the s

Chemical bonding, When NaCl is dissolved in water, the sodium ion become

When NaCl is dissolved in water, the sodium ion become

Illustrate born-haber cycle, Q. Illustrate Born-Haber cycle? Boron is a...

Q. Illustrate Born-Haber cycle? Boron is always covalent and does not form,B 3+ ions, because' the energy required to remove three electrons is very high. Many simple compo

Indicator , what is indicators?explain theories of indicators?

what is indicators?explain theories of indicators?

Basics of potentiometry, Basics of Potentiometry: In this unit, you ha...

Basics of Potentiometry: In this unit, you have learnt about electrode potentials, principles of potentiometer and measurement of potential, different types of reference elect

Inorganic, the diagnal relationship in periodic table

the diagnal relationship in periodic table

Anomalous behaviour of beryllium, anomalous behaviour of beryllium

anomalous behaviour of beryllium

Assignment, Applications of radiometric titration in pharmaceutical industr...

Applications of radiometric titration in pharmaceutical industry #

Polymers, explanition

explanition

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