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, LIMITATION OF THIRD LAW OF THERMODYNAMICS

LIMITATION OF THIRD LAW OF THERMODYNAMICS

Prefix - iupac system of naming organic compounds, Prefix - IUPAC System of...

Prefix - IUPAC System of Naming Organic Compounds There are several groups that are not regarded as functional groups in the IUPAC name of the substance. These are linked as su

Valence Bond Theory, What are the limitations of valence bond theory?

What are the limitations of valence bond theory?

What are the types of acceptance tests?, What are the Types of Acceptance T...

What are the Types of Acceptance Tests? There are two main aspects to acceptance testing: Measurement of Acceptability  Comparison of acceptability or preference

Determine the ionisation potential of a hydrogen atom, The ionisation poten...

The ionisation potential of a hydrogen atom is -13.6 eV. What will be the energy of the atom corresponding to n= 2 . (1) -3.4 eV           (2)-6.8 eV      (3) -1.7 eV

Physical properties of cycloalkane, Physical properties of Cycloalkane ...

Physical properties of Cycloalkane  (i) In Cycloalkane First two members are gases, next three members are liquids and higher ones are solids. (ii) Cycloalkane is not solubl

Degree of unsaturation procedure, what is the procedure on how to get degre...

what is the procedure on how to get degree of unsaturation in a fruit

Boron, Equivalent Weight

Equivalent Weight

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