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

Physical properties of benzene, Physical Properties of benzene (a) Firs...

Physical Properties of benzene (a) First property of Benzene is that it is a colourless, mobile and volatile liquid. Its boiling point is 80°C and freezing point is 5.5°C. It c

#radiomatric titration, Advantages of radiometric titration

Advantages of radiometric titration

#trihydric alcohol, preparation method of glycerol

preparation method of glycerol

The equation, The equation Δ x Δp ≥ h/ 4Π shows: (1) de-Broglie relat...

The equation Δ x Δp ≥ h/ 4Π shows: (1) de-Broglie relation (2) Heisenberg's uncertainty principle (3) Aufbau principle (4) Hund's rule ans: Heisenberg'

TOLUENE, HOW TOLUENE CAN BE PREPARED

HOW TOLUENE CAN BE PREPARED

Stoichiometry and Mole Concept, What volume of oxygen would be required to ...

What volume of oxygen would be required to burn completely 200 ml of acetylene and what would be the volume of carbon dioxide formed?

Ph metric titration, advantages and dis advantages?

advantages and dis advantages?

Ion electron method, PbO2 + Cl_ gives Pb(OH)3_ + ClO_

PbO2 + Cl_ gives Pb(OH)3_ + ClO_

The outlet temperature, You are interested in modelling a 10 m surge tank ...

You are interested in modelling a 10 m surge tank which holds the products exiting a plug flow reactor, as shown below. One of the purposes of the tank is to heat the reactor prod

Explain the hydrogenation, Which of the following rate equations is correct...

Which of the following rate equations is correct, if the hydrogenation of the adsorbed intermediate is the slowest step of the reaction? When zinc oxide is used as

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