Trace amounts of rare elerments are found within Emission roundwater and are of

Q: Trace amounts of rare elerments are found within Emission roundwater and are of

a] Apply dilution formula M1V1 = M2V2 the 23.2 mL is of the standard solution @ 0.152 ppb. The concentration of the 50 mL sample is the unknown. i.e. 23.2 mL is V1, 0.152 ppb is M1, 50 mL is V2, and M2 is unknown. 0.152* 23.2 = 50*M2 M2 = 0.070528 ng /ml b) 9.81*15.2 = M2*50 M2 = 2.98224 ng /ml Simple formula

ID: 542724 • Letter: T

Question

Trace amounts of rare elerments are found within Emission roundwater and are of interest to geochemists. Éuropium and terbium are lanthanide-series elements hat can be measured from the intensity of their fluorescence emitted when a solution is illuminated with ultraviolet radiation. Certain organic compounds Eu(IlIl) and Tb(llI) enhance the emission, and substances found in natural waters can decrease the emission. For that reason it is necessary to use standard additions to the sample to correct for such interference. The graph at the right shows the result of such an experiment in which the concentration of Eu(III) and Tb(III) was measured in a sample of groundwater. 30 25 20 15 10 in each case 10.00 mL of sample solution and 15.00 mL of of organic additive were placed in 50-mL volumetric flasks. Eu() standards (0, 5.00, 10.00. 15.00, and 20.00 mL) were added and the flasks were diluted to 50.0 mL with water. -232 ml Tb(8) -9.81 mL -25-20-15-10-5 Added volumed tandard,L) (a) Eu(Il) analysis (b) Tb(IIl) analysis The Eu(lill) standards added to the groundwater sample contained 0.152 ng/mL (ppb) of Eu(ill). Calculate the concentration of Eu(l) in the groundwater sample The Tb(lll) standards added to the groundwater sample contained 15.2 ng/mL (ppb) of Tb(lll). Calculate the concentration of Tb(ll) in the groundwater sample Number Number ng/mL ng/mL O Previous G ve Up & Varw Scution O Check Answer 0 Next Exit ) Hint

Explanation / Answer

Apply dilution formula

M1V1 = M2V2

the 23.2 mL is of the standard solution @ 0.152 ppb. The concentration of the 50 mL sample is the unknown.

i.e. 23.2 mL is V1, 0.152 ppb is M1, 50 mL is V2, and M2 is unknown.

0.152* 23.2 = 50*M2

M2 = 0.070528 ng /ml

9.81*15.2 = M2*50

M2 = 2.98224 ng /ml

Simple formula

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Trace amounts of rare elerments are found within Emission roundwater and are of

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