Does the AAS manual suggest a maximum measurement concentration?

I suspect your 1000ppm solution is too concentrated and is saturating the detector of your AAS.

What is your calibration range? What form of Sr was used in the calibration?

Have you correctly accounted for the water of hydration of the strontium chloride?

Does this mean that you wanted to measure how much strontium is in a portion of a particular strontium chloride?

Yes Zbigniew Jońca

To determine analytically how much Sr is in a given SrCl2, titration is often used, e.g. with EDTA. However, the FAAS technique is useful, if necessary, to measure the content of admixtures of other elements.

Direct measurements using the FAAS technique are possible, but their uncertainty will usually be 1:100 or slightly better. It takes a lot of effort, because the condition is to have a sufficiently accurate calibration solution (one or more), with a concentration close to the concentration of the solution measured. They must be concentrations that remain within the optimal range of values for measurements of this element using the FAAS technique. In the case of an acetylene-air flame, it will be from several to a dozen mg/L, and in the case of an acetylene-nitrous oxide flame, up to several mg/L. And how much exactly depends on the selection of strictly instrumental measurement parameters (determined experimentally) on a given AA spectrometer and the chemical conditions, i.e. the composition of the measured solution, e.g. the use of hydrochloric acid, not nitric acid, or the addition of auxiliary substances stabilising the signal of the measured element.

Small Sr concentrations, at a few mg/L, are easier to precisely measure in an acetylene-nitrous oxide flame using the FAES technique, i.e. emission rather than absorption.

In any case, simple titration can give a much more accurate, faster and cheaper result than flame measurements using the FAAS or FAES technique. Unless the analyst is highly skilled in measurements using a FAAS/FAES spectrometer and has already prepared appropriate calibration solutions. And if the requirements for the uncertainty of measurement results will not be high.

If it's not a secret, write why you need the measurement result of the Sr content in this SrCl2.

Regards

ZJ

Zbigniew Jońca Thank you so much for such a wonderful explanation. I am currently working on the adsorption of heavy metal ions from wastewater. I have performed many experiments for organic pollutants using UV spectroscopy but for metal ion detection this is my first time working on AAS.

Dear Ayushi:

Is there a possibility of a common mistake that many of us tend to overlook during solution preparation and calculation?:

When you say a 1 mg/mL solution, is it 1 mg of the salt SrCl2.6H2O in 1 mL solution, or 1 mg of Sr in 1 mL.

The molar mass of Sr.Cl2.6H2O is 266.6, and the atomic mass of Sr is 87.6.

If you make a 1000 ppm solution of the "salt", it will have only 87.6/266.6 = 329 ppm of "Sr", which seems to be very close to the concentration you are measuring.

As already suggested, it is also important to dilute the solutions if necessary to bring the measured concentration to the linear range of the instrument.

I would also recommend that you do all the solution-preparation, dilution, etc. on a mass/mass (gravimetric) basis rather than mass/volume basis, which avoids all the errors due to density variations, etc. and give you much more accurate numbers with less uncertainty.

Dear Sir @NimalDeSilva

Thank you so much for this explanation. I exactly followed the method you explained. and i got exact concentration

thanks and regards