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

Empirical Formula, A 4.00-g sample of iodine was reacted completely with ex...

A 4.00-g sample of iodine was reacted completely with excess bromine. The mass of the compound formed was 11.56-g. Determine the empirical formula.

221, How many grams of CO2 will be produced from burning 115.5 grams of C4H...

How many grams of CO2 will be produced from burning 115.5 grams of C4H8 with 310.5 grams of oxygen given the following equation..... C4H8 + 4 O2 = 2 CO2 +4 H2O

Atomic structurew, the increasing order(lower first) for the values of e/m ...

the increasing order(lower first) for the values of e/m (charge/mass) for e,p,n,a?

Polyglycolic acid or pga - polymers, Polyglycolic acid (PGA) : It is acq...

Polyglycolic acid (PGA) : It is acquired by the chain polymerisation of cyclic dimer of glycolic acid, OH-CH2-COOH.

#titlecarbon, bilogical importance of carbon coumpounds

bilogical importance of carbon coumpounds

Diagram, caustic embrittlement

caustic embrittlement

Explain about heterogeneous mixture, Q. Explain about heterogeneous mixture...

Q. Explain about heterogeneous mixture? A heterogeneous mixture is one that isn't blended smoothly throughout. Illustrations of heterogeneous mixtures include smoky air and m

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