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

Thermodynamicst, Extension

Extension

Ionisation enthalphy, what is the relevance of half filled and completely f...

what is the relevance of half filled and completely filled orbitals in ionisation enthalphy ditermination

What is the upac name, What is the upac name of CH-CH-CH-OH

What is the upac name of CH-CH-CH-OH

Acid and alkalis, jack prepared copper(11) sulphate by adding a metal oxide...

jack prepared copper(11) sulphate by adding a metal oxide to the acid. jill prepared sodium chloride by acid/alkali reaction. name the metal oxide and acid jack would use to mak

Polonium crystallizes in a simple cubic unit cell, polonium crystallizes in...

polonium crystallizes in a simple cubic unit cell with an edge length of 3.36A. 1. what is the volume of the unit cell? 2. what is the volume of atom in the unit cell? 3. what i

.inorganic experiment, The oxidation of nitric acid principle

The oxidation of nitric acid principle

Pressure vs. mole fraction of cyclooctane , Consider a 2-component system o...

Consider a 2-component system of cyclooctane(1) and styrene(2) at 350 °C. Both component can be well described with the Soave-Redlich-Kwong equation of state in the mixed vapor and

#title colonel electrode, 1

1

Esters, introduction to esters ,preparation, proprties, and their uses in d...

introduction to esters ,preparation, proprties, and their uses in daily life

What is meant by integrated coastal zone management, Question : (i) Wh...

Question : (i) What is meant by Integrated Coastal Zone Management? (ii) What is its main objective? (iii) List the principal measures involved in the implementatio

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