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

Lubricant., Explain the mechanism of fluid film or hydrodynamic lubrication...

Explain the mechanism of fluid film or hydrodynamic lubrication.

The maximum amount of ba3(po4)2, If 0.5 mol of BaCl 2 is mixed with 0.20 m...

If 0.5 mol of BaCl 2 is mixed with 0.20 mol of Na 3 PO 4 , the maximum amount of Ba 3 (PO4) 2 that can be formed is 3 BaCl 2 + 2 Na3PO 4 = Ba 3 (PO4) 2 + 6NaCl Here cle

Uses of acetic acid - carboxylic acids, Uses of Acetic Acid - Carboxylic ac...

Uses of Acetic Acid - Carboxylic acids (a) Acetic Acid is used as a solvent and a laboratory reagent. (b) Acetic Acid is used as vinegar for table purpose and for manufactur

Show the units of measurement, Q. Show the Units of Measurement? You mo...

Q. Show the Units of Measurement? You most likely know your height in feet and inches. The majority people outside the United States however measure height in meters and centim

Stereoisomers, how to draw 3D stereoisomers for a compound?

how to draw 3D stereoisomers for a compound?

Double titration, how to determine the strength ofpotassium dichromate with...

how to determine the strength ofpotassium dichromate withFAS and N-phenyl anthranilic acid as an internal indicator

Determine strongest bond, Among the bonds formed by a chlorine atom with a...

Among the bonds formed by a chlorine atom with atoms of hydrogen, chlorine, sodium and carbon, the strongest bond is formed between (1) H- cl

Uncertainty in the position of an electron is zero, If uncertainty in the p...

If uncertainty in the position of an electron is zero, the uncertainty in its momentum would be: (1) Zero    (2) (3) > h/ 2γ                            (4) Infinite

Show the process of ion exchange chromatography, Q. Show the Process of ion...

Q. Show the Process of ion exchange chromatography? The process of ion exchange chromatography is the most important, effective and rapid method for the separation and purifica

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