Exp_4_Atomic_Absorption_Spectrophotometry

Exp_4_Atomic_Absorption_Spectrophotometry - 0.1 0.15 0.2...

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Exp: # 04 Abdullah Barashid Nov 27 th 2006 Sec: # 51 236343 Omar Bugshan 236287 Title: ATOMIC ABSORPTION SPECTROPHOTOMETRY (Determination of Copper in Copper ore using Atomic Absorption Spectrophotometry) Objective: "To determine the concentration of copper in copper ore using external standards calibration method." Apparatus: Atomic absorption / emission spectrometer. Burette 10ml volume Volumetric flasks, 1L, 100 mL Beaker 250 mL Pipetter: 20 mL Graduated cylinder 100 mL Chemicals: Copper ore Concentrated HNO 3 1:1 H 2 SO 4 Standard Cu 2+ solution (100 mg/L) Data: Flask # mL stock copper solution concentration of std Cu(II) solution mL of Unknown Absorbance 1 (blank) 0.0 0 0 0.003 2 0.5 0.54 0 0.014 3 1.0 1.08 0 0.034 4 5.0 5.4 0 0.230 * 5 7.0 7.56 0 0.276 6 10.0 10.8 0 0.363 7(Unk) 0.0 0 20 0.110
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Calibration Curve y = 0.035x + 0.0051 R 2 = 0.9842 0 0.05
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Unformatted text preview: 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 2 4 6 8 10 12 Copper conc. ppm Absorbance from the calibration curve: A = 0.035 C + 0.0051 The unknown (# 82) recorded an absorbance of 0.110 0.11 = 0.035 C + 0.0051 C = 2.997 ppm initial conc. Cu = 2.997 x (100mL / 20mL) = 14.99 ppm = 0.01499 g/L The percentage of Cu in ore: Cu 2+ % = (0.01499 / 0.108) x 100% = 13.88 % Conclusion: In this experiment, the atomic absorption technique was used to determine copper, using AA Spectrophotometry. The emission line was selected using a HCL for copper. The ore sample was weighed, and in solution. Using external standard solutions of copper, a calibration curve was constructed and the percentage of copper in ore was determined....
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Exp_4_Atomic_Absorption_Spectrophotometry - 0.1 0.15 0.2...

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