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

Calculate the number of photons per second, What is the percentage of light...

What is the percentage of light that is engaged by the sample after a path length of 1 µm? Calculate the number of photons per second absorbed by the sample.   T

Illustrate classification of emulsions, Q. Illustrate Classification of Emu...

Q. Illustrate Classification of Emulsions? Emulsions are classified as: • Oil-in-water emulsion: This is a colloidal dispersion in which droplets of oil are dispersed in

The experimental observation correctly account phenomenon, In which one of ...

In which one of the following pairs of experimental observations and phenomenon does the experimental observation correctly account for phenomenon: (1) X-ray spectra

Lanthanides & acinides, 1. why YbS and YbI2 are semiconducting solids but L...

1. why YbS and YbI2 are semiconducting solids but LaS and LaI2 show metallic character. 2. Why is aqueous solution of Eu2+ thermodynamically less susceptible to oxidation than any

Classification of coordination compounds, Classification of Coordination Co...

Classification of Coordination Compounds Since the number of known complexes is so large, we need to classify and categorise them  in order to study their chemistry systematica

Purification of organic compounds, Purification of organic compounds S...

Purification of organic compounds Several methods are available for the purification of substances. Though, the selection of method, depends upon the nature of substance (if s

Structural needs for hyperconjugation, Structural needs for hyperconjugatio...

Structural needs for hyperconjugation (i) Compound could comprise at least one Sp 2 -hybrid carbon of as well alkene alkyl carbocation or alkyl free radical. (ii) ∝- carbon

Beneficiation of ores, Q. Beneficiation of Ores? Most of the ores avail...

Q. Beneficiation of Ores? Most of the ores available in nature contain large amounts of impurities, i.e. gangue. Direct extraction of metals from the ores by metallurgical proc

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