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

Organic chemistry, What are the theoretical physical properties of esters?

What are the theoretical physical properties of esters?

Mole fraction, The mole fraction of solute and solvent is equal to

The mole fraction of solute and solvent is equal to

Food chemistry, discuss the dietary functional properties of calcium in foo...

discuss the dietary functional properties of calcium in foods

For d electrons, For d electrons, the azimuthal quantum number is: (1) ...

For d electrons, the azimuthal quantum number is: (1) 0        (2) 1        (3) 2        (4) 3 Ans: 2

Chemical bond, what is chemical bond and his type?

what is chemical bond and his type?

Compounds containing nitrogen, which compounds will dissolve in alkaline so...

which compounds will dissolve in alkaline solution after it has undergone reaction with hinsberg reagent

Sets of quantum numbers is correct for an electron, Which of the following ...

Which of the following sets of quantum numbers is correct for an electron in 4f orbital: (1) n-=4, l=3. m+1, s= +1/2              (2) n-=4, l=4. m-4, s= -1/2

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