User:Melissa Novy/Notebook/CHEM-572/2013/03/26

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<!-- sibboleth --><div id="lncal1" style="border:0px;"><div style="display:none;" id="id">lncal1</div><div style="display:none;" id="dtext">04/02/2013</div><div style="display:none;" id="page">User:Melissa Novy/Notebook/CHEM-572/2013/03/26</div><div style="display:none;" id="fmt">yyyy/MM/dd</div><div style="display:none;" id="css">OWWNB</div><div style="display:none;" id="month"></div><div style="display:none;" id="year"></div><div style="display:none;" id="readonly">Y</div></div>

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Objectives

  • Continue silver ISE studies for the determination of Ag+ in solution.
  • Filter more 100Ag-LMT, made on ??? for future use.


Calibration Curve of [Ag+] for Silver ISE

  • The calibration curve for [Ag+] was redone in polypropylene containers to account for the adsorption of Ag+ on glassware. AgNO3 solutions made on 2013/03/19 were used and at concentrations according to the table below. Note that the solution of concentration 1 μM AgNO3 was discarded from the calibration curve, because the detection limit of the silver ISE is around 10 μM Ag+.
  • The protocol for calibration is as follows:
    1. Using an automated pipetter, add 3 mL of AgNO3 into a 15-mL polypropylene Falcon tube.
    2. Then using the same method, add 0.060 mL of 5 M KNO3 to the solution as an ionic strength adjustor.
    3. Rinse the silver ISE with deionized water and dry gently with KimWipes.
    4. Place the silver ISE into the AgNO3 solution and allow it to equilibrate.
    5. Record the conductivity value in mV.
    6. Repeat the measurement twice more for each solution to be tested.


Initial [Ag+] [M] Final [Ag+] [M] log [Ag+] [] Conductivity [mV] ' ' Average Conductivity [mV] Standard Deviation [mV] Corrected Conductivity [mV]
Trial 1 Trial 2 Trial 3
0 0 --- 341.9 340.2 335.6 339.2333333 3.259345538 0
0.000001 9.80392E-07 -6.008600172 328.3 329.6 331 329.6333333 1.350308607 -9.6
0.00001 9.80392E-06 -5.008600172 328.5 330.6 329.4 329.5 1.053565375 -9.733333333
0.0001 9.80392E-05 -4.008600172 357.2 359.2 359.5 358.6333333 1.250333289 19.4
0.001 0.000980392 -3.008600172 417.6 417.1 416.6 417.1 0.5 77.86666667
0.01 0.009803922 -2.008600172 472.8 473.3 473.6 473.2333333 0.404145188 134
0.1 0.098039216 -1.008600172 527.2 527.5 528 527.5666667 0.404145188 188.3333333

Ag+ Calibration Curve 3-26-2013.jpg

Analysis of Silver ISE Data

  • Conductivity and [Ag+] of PLA2002D + 5wt% LMT Solutions
Time [min] Conductivity [mV] Corrected Conductivity [mV] Positive Error Negative Error Calculated [Ag+] [M]
0 283.5333333 45.33333333 9.265167744 -9.265167744 0.000187943
30 285 44.93333333 16.35878969 -16.35878969 0.000184584
60 258.1333333 17.86666667 5.159780357 -5.159780357 5.44796E-05
90 246.5 9.966666667 4.257933771 -4.257933771 3.81552E-05
120 231.1 -4.366666667 8.190238092 -8.190238092 1.99944E-05
1380 225.3666667 -100.0666667 5.822656896 -5.822656896 2.67375E-07


  • Conductivity and [Ag+] of PLA2002D + 5wt% 100AgLMT Solutions
Time [min] Conductivity [mV] Corrected Conductivity [mV] Positive Error Negative Error Calculated [Ag+] [M]
0 233.5333333 -4.666666667 5.257692777 -5.257692777 1.97258E-05
30 233.5333333 -6.533333333 9.250045045 -9.250045045 1.81337E-05
60 230.4666667 -9.8 4.00666112 -4.00666112 1.56504E-05
90 233.4333333 -3.1 4.645786622 -4.645786622 2.11695E-05
120 229.8333333 -5.633333333 6.553116307 -6.553116307 1.88846E-05
1800 319.6333333 -5.8 7.779674372 -7.779674372 1.87432E-05