Can you help me$?$ Am i ploting it correctly?

Im confused on how to plot tge absorbance vs spiked concentration

$6$ Fine powder beans : $3\mathrm{.}3011$g

Blank: $0\mathrm{.}263$ abs $0\mathrm{.}273$ abs

Average: $0\mathrm{.}26$

$40$ ml: $0\mathrm{.}432$ abS. $0\mathrm{.}435$ abs

Average: $0\mathrm{.}4335$ abs

$60$ml: $0\mathrm{.}480$ abs $0\mathrm{.}487$ abs

Average: $0\mathrm{.}4835$ abs

Prsent the data table $($samples and absornace

Plot the absorbance vs spiked concentration $(2$mL unk spiked different volumes of standard$).$

Measurement of Zinc in Foods by Graphite Furnace Atomic Absorption Spectrometry

Objectives:

$(1)$ The principle behind atomic absorption $($AA$)$ spectrometry.

$(2)$ Application of the method of standard addition.

$(3)$ Solid sample digestion process.

Instrumentation:

A Shimatzu Atomic Absorption Spectrometer $7000$ will be used for all the analyses. The use of an autosampler can greatly enhance the sample throughput.

Principles:

Graphite furnace atomic absorption spectrometry $($GFAAS$)$ is a type of optical spectrometry that uses a graphite$-$coated furnace to vaporize the sample and measure the light absorbance of the analytes in the gas phase. Briefly, the technique is based on the fact that free atoms will absorb light at wavelengths characteristic of the element of interest $($hence the name atomic absorption spectrometry$).$ Within certain limits$,$ the amount of light absorbed is linearly correlated to the analyte concentration. Free atoms of most elements can be produced from samples by the application of high temperatures. In GFAAS, samples are deposited in a small graphite$-$ or pyrolytic carbon$-$coated graphite tube $($cf$.$ Figures $1$ and $2),$ which can then be heated to $2000C$ to vaporize and atomize the analyte. The atoms absorb ultraviolet or visible light and make transitions to higher electronic energy levels. Applying the Beer$-$Lambert law directly in AA spectroscopy is difficult due to variations in the atomization efficiency from the sample matrix, and nonuniformity of concentration and path length of analyte atoms.

Compared to flame AAS, GFAAS has a higher sensitivity$,$ and only a small amount of the sample is consumed during the measurement. The figure below shows the detail of graphite furnace tube $($bottom$)$ and how it is mounted and aligned to the light source and the detector $($top$).$

Figure $2.$ Diagram for Graphite Furnace Tube $($Bottom$)$ and Its Placement in an Atomic Absorption Spectrometer $($Top$)$

In the standard addition method, a small amount of analyte of high concentration $($purity$)$ is spiked $($added$)$ into an aliquot of the unknown sample. The unknown and the spiked unknown are then analyzed under identical experimental conditions and procedures. If the instrument response is linear over the range between the sample concentration, $x,$ and the combination of sample and spike, $x+a,$ the sample concentration can be deduced by solving equations $1$ and $2.$

$S_{\text{u}\text{n}\text{k}}=k{C}_{\text{u}\text{n}\text{k}}$

$S^{\text{'}}=k(C_{\text{u}\text{n}\text{k}}+C_{\text{s}\text{p}\text{i}\text{k}\text{e}\text{d}})$

$($Eq$.1)$

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