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

Thermodynamics, Calculate the total heat (in J) needed to convert .777 mole...

Calculate the total heat (in J) needed to convert .777 moles of gaseous ethanol at 300 degrees C and 1 atm to liquid ethanol at 25 degrees C and 1 atm. Extra info: b.p. 78.5 degree

Energy level, For the n= 2  energy level, how many orbitals of all kinds ar...

For the n= 2  energy level, how many orbitals of all kinds are possible: (1) 2        (2) 3        (3) 4        (4) 5 Ans: 4

Physical properties of dihydrogen, I want information on physical propertie...

I want information on physical properties of dihydrogen

Regeneration of true exhausted zeolite bed, Q.   How is true exhausted Zeol...

Q.   How is true exhausted Zeolite bed regenerated? Give the merits and demerits of Zeolite process.                                                                    OR

Titration, how is back titration graphs drawn

how is back titration graphs drawn

Mucopolysaccharide, descibe mucopolysaccharide and its biological importanc...

descibe mucopolysaccharide and its biological importance

Environmental chemistry, Environmental pollution: Soil, water and air pollu...

Environmental pollution: Soil, water and air pollution

Electronic configuration for oxygen is correct hunnd rule, Which electronic...

Which electronic configuration for oxygen is correct according to Hund's rule of multiplicity: (1) 1s 2 , 2s 2 , 2p 2 x , 2p 1 y , 2p 1 z                       (2) 1s 2

Why is the third ionization energy of manganese, Mention the major reason f...

Mention the major reason for the anomalous behaviour of lithium in Group of the periodic table. Why is the third ionization energy of manganese (At. No. =25) unexpectedly high?

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