Metodos Afetan.docx

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Tabla 1. Selección de tubos comunes para usarlos como celdas. Tubo No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 14

% T400 (H2O) 95 95 95 95.2 95.2 95.2 95 95 95 95 95.2 95.2 95 95.2 95.2

Tubo No.

% T400 (NiSO4)

Tabla 2. Curva de calibración para Fe3+ por el método del NH4SCN. Tubo No.

Fe3+ (μg/mL)

1 2 3 4 5 6 7 8 9 10 11 12 13

A480

. 116𝑥10−3 . 349𝑥10−3 . 698𝑥10−3 . 116𝑥10−2 . 174𝑥10−2 . 232𝑥10−2 . 290𝑥10−2 . 349𝑥10−2 . 407𝑥10−2 . 465𝑥10−2 . 581𝑥10−2 . 814𝑥10−2 . 127𝑥10−1

Fe3+, M=0.00025, PM= 55.84 g/mol, volumen final= 6mL M= g / PM (g= M x PM) x 1000 = μg Fe3+ μg -------1000mL

“A” ajustada por regresión lineal

Rx ------- Fe3+ (mL) Rx / volumen final = Resultado

Tabla 3. Datos para aplicar el método de Ringbon en la determinación de Fe3+ por el método del SCN. Tubo No. 1 2 3 4 5 6 7 8 9 10 11 12 13

Fe3+ (μg/mL) . 116𝑥10−3 . 349𝑥10−3 . 698𝑥10−3 . 116𝑥10−2 . 174𝑥10−2 . 232𝑥10−2 . 290𝑥10−2 . 349𝑥10−2 . 407𝑥10−2 . 465𝑥10−2 . 581𝑥10−2 . 814𝑥10−2 . 127𝑥10−1

Log (Fe3+)

A480

%T

Absortancia

-3.93554201 -3.45717457 -3.15614458 -2.93554201 -2.75945075 -2.63451202 -2.537602 -2.45717457 -2.39040559 -2.23582387 -2.23582387 -2.0893756 -1.89619628

Tabla 4.efecto de la concentración de –SCN en la determinación de Fe3+. Tubo No. 1 2 3 4 5 6 7

SCN - (μg/mL) 0.29 0.87 2.90 5.80 8.70 11.60 14.50

Fe3+ (μg/mL) . 418𝑥10−2 . 418𝑥10−2 . 418𝑥10−2 . 418𝑥10−2 . 418𝑥10−2 . 418𝑥10−2 . 418𝑥10−2

SCN - / Fe3+ 69.37 208.13 693.77 1387.55 2081.33 2775.11 3468.89

Fe3+, M=0.00025, PM= 55.84 g/mol, volumen final= 5mL M= g / PM (g= M x PM) x 1000 = μg Fe3+ μg -------1000mL Rx ------- Fe3+ (mL) Rx / volumen final = Resultado -SCN, M=0.05, PM= 58 g/mol, volumen final= 5mL

A480 0.243 0.426 0.528 0.620 0.660 0.680 0.722

M= g / PM (g= M x PM) x 1000 = μg -SCN μg -------1000mL Rx ------- -SCN (mL) Rx / volumen final = Resultado

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