User:Puja Mody/Notebook/Magnetite Shenanigans/2014/09/22: Difference between revisions
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== | ==UV-Vis standards== | ||
* | * Standards needed to be made of R6G in order to calculate the amount of dye that was absorbed and how much dye remains in the solution. | ||
Molar Absorptivity of R6G: 116000 LMol<sup>-1</sup>cm<sup>-1</sup> | |||
Assumed stock concentration: .005 M | |||
*Because the absorbance of R6G is so high, standard concentrations needed to be diluted to below 8 μM. | |||
Table 1. Standard concentrations in 2mL solutions | |||
{| {{table}} | |||
| align="center" style="background:#f0f0f0;"|'''Standard Concentrations (uM)''' | |||
| align="center" style="background:#f0f0f0;"|'''Actual Concentration (M)''' | |||
| align="center" style="background:#f0f0f0;"|'''Absorbance''' | |||
|- | |||
| 0||0||0 | |||
|- | |||
| 2||1.59483E-06||0.185 | |||
|- | |||
| 4||3.18966E-06||0.37 | |||
|- | |||
| 6||4.78448E-06||0.555 | |||
|- | |||
| 8||6.37931E-06||0.74 | |||
|} | |||
[[Image:R6G calibration curve.jpg]] | |||
*The concentration of the original stock solution was 398.7μM | |||
Table 2: Actual concentration of dye in eppendorf samples | |||
{| {{table}} | |||
| align="center" style="background:#f0f0f0;"|'''Sample number''' | |||
| align="center" style="background:#f0f0f0;"|'''believed concentration''' | |||
| align="center" style="background:#f0f0f0;"|'''Concentration in 1mL solution (uM)''' | |||
| align="center" style="background:#f0f0f0;"|'''molar concentration in epp tubes (M)''' | |||
|- | |||
| 1||20||15.94827586||1.59483E-05 | |||
|- | |||
| 2||40||31.89655172||3.18966E-05 | |||
|- | |||
| 3||60||47.84482759||4.78448E-05 | |||
|- | |||
| 4||80||63.79310345||6.37931E-05 | |||
|- | |||
| 5||100||79.74137931||7.97414E-05 | |||
|- | |||
| 6||150||119.612069||0.000119612 | |||
|- | |||
| 7||200||159.4827586||0.000159483 | |||
|} | |||
==Notes== | |||
-These samples were left for too long without being tested and resulted in some of the dye releasing out of the complexes. For this reason, UV-Vis of these samples were not fully run and new samples were made. | |||
Latest revision as of 00:20, 27 September 2017
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UV-Vis standards
Molar Absorptivity of R6G: 116000 LMol-1cm-1 Assumed stock concentration: .005 M
Table 1. Standard concentrations in 2mL solutions
Table 2: Actual concentration of dye in eppendorf samples
Notes-These samples were left for too long without being tested and resulted in some of the dye releasing out of the complexes. For this reason, UV-Vis of these samples were not fully run and new samples were made.
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