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

Chemistry collective virtual simulator, Introduction This lab will be ...

Introduction This lab will be performed using the Chemistry Collective Virtual Lab Simulator. The ChemCollective is an award winning chemistry online resource. In addition to

The structure of spiropentadiene, The structure of spiropentadiene The ...

The structure of spiropentadiene The structure of spiropentadiene is shown below; it undergoes a Diels-Alder reaction with two molar equivalents of 1,3-cyclopentadiene. Spirope

Write a feature of metallic solid from an ionic solid, Write a feature whic...

Write a feature which will distinguish a metallic solid from an ionic solid. a) Explain 'order of a reaction'. b) What is an emulsion?

Types of chemical reactions, In the reactant SO2 + O2 , then in the product...

In the reactant SO2 + O2 , then in the product it became SO3 , how?

Determine the uniqueness of carbon, Q. Determine the Uniqueness of Carbon? ...

Q. Determine the Uniqueness of Carbon? Ans. Carbon forms a very large number of compounds--over 4,000,000. This is far more than the number of compounds of all other eleme

Structure of covalent bonds, Q. Structure of Covalent Bonds? Ans. ...

Q. Structure of Covalent Bonds? Ans. A covalent bond forms between elements that are near each other in the periodic table While an ionic bond involves an exchange of e

Mass, How many grams of NaCl will be produced when 2235 g of HCl are neutra...

How many grams of NaCl will be produced when 2235 g of HCl are neutralized by an excess of NaOH according to the equation below? HCl + NaOH ---> H2O + NaCl

Explain about the impact extrusion, Explain about the Impact extrusion ...

Explain about the Impact extrusion Blank is placed over the die and pressed by punch. Metal is squirted upward round the punch. Thickness of the part is fixed by the gap bet

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