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

What is the equation for the reaction of sodium nitroprussi., What is the e...

What is the equation for the reaction of sodium nitroprusside with a ketone

Show applications of coordination compounds, Q. Show Applications of coordi...

Q. Show Applications of coordination compounds? Innumerable applications of coordination compounds in fields as divergent as biology,  industry. Agriculture, analytical chemist

Numerical, 150ml of a gas at 27C is heated to 77C at constant pressure.find...

150ml of a gas at 27C is heated to 77C at constant pressure.find the new volume of the gas.

What is inert pair effect, The reluctances of ns electrons in the participa...

The reluctances of ns electrons in the participation of bond formation is known as inert pair effect

Hardness, define hardness and its type?

define hardness and its type?

Nitrogen -p block element, NITROGEN Nitrogen is the great strength of th...

NITROGEN Nitrogen is the great strength of the triple bond makes N2 thermodynamically and kinetically stable but moderately electronegative element. The atom can form three sing

Temperature independence paramagnetism, What do you understand by temperatu...

What do you understand by temperature independence paramagnetism? Ans) Compounds which are expected to be diamagnetic may exhibit this kind of weak paramagnetism. It arises from a

the density of cesium chloride, Determine the density of cesium chloride w...

Determine the density of cesium chloride which crystallises in bcc type structure with the edge length 412.1 pm.The atomic masses of Cs & Cl are 133 & 35.5 respectively.   Solution

Organic- ammine, can we reduce r-cn to primary ammines using fe/hcl

can we reduce r-cn to primary ammines using fe/hcl

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