Experimental Conditions
It is important to note that in our lab experiment we used galena, PbS, with 170 – 200 mesh (i.e. there were 170 to 200 wires per inch of sieve used to sort out the galena crystals). This means our diameter range of our particle size was 75-90 μm.
Table 1:Experimental Conditions for PbS leaching
FeCl3·6H2O (g) to be added is found by:
The weight of FeCl3·6H2O (g) added in our experiment was slightly larger than the theoretical amount of FeCl3·6H2O needed, as can be seen from the example equation below:
Atomic Absorption Calibration Data
We were asked to prepare a 10 g/L HCl solution from a 200 g/L standard solution, and found the volume by:
Thus, we add 5 mL of 200 g/L HCl to get 100 mL of our 10 g/L HCl solution. …show more content…
With this information, we must adjust the [Pb] ppm, as adjusting the volume of the pipettes to match the [Pb] ppm is not a possibility. We know that 1 ppm is equivalent to 1 mg/L, thus we can re-evaluate our [Pb] ppm values from the same equation as above:
With this information, we can complete the Table 3 for Lab 5 found in the Lab Manual:
Table 2: Preparation Details of Pb Atomic Absorption (AA) standards
For our Atomic Absorption (AA) calibration, we received this data:
Table 3: Absorbance for [Pb] in Standards
And, if we plot the absorbance against the Pb concentration, we get:
PbS Analysis
It is important to note that in our lab experiment we used galena, PbS, with 170 – 200 mesh (i.e. there were 170 to 200 wires per inch of sieve used to sort out the galena crystals). This means our diameter range of our particle size was 75-90 μm.
Table 1:Experimental Conditions for PbS leaching
FeCl3·6H2O (g) to be added is found by:
The weight of FeCl3·6H2O (g) added in our experiment was slightly larger than the theoretical amount of FeCl3·6H2O needed, as can be seen from the example equation below:
Atomic Absorption Calibration Data
We were asked to prepare a 10 g/L HCl solution from a 200 g/L standard solution, and found the volume by:
Thus, we add 5 mL of 200 g/L HCl to get 100 mL of our 10 g/L HCl solution. …show more content…
With this information, we must adjust the [Pb] ppm, as adjusting the volume of the pipettes to match the [Pb] ppm is not a possibility. We know that 1 ppm is equivalent to 1 mg/L, thus we can re-evaluate our [Pb] ppm values from the same equation as above:
With this information, we can complete the Table 3 for Lab 5 found in the Lab Manual:
Table 2: Preparation Details of Pb Atomic Absorption (AA) standards
For our Atomic Absorption (AA) calibration, we received this data:
Table 3: Absorbance for [Pb] in Standards
And, if we plot the absorbance against the Pb concentration, we get:
PbS Analysis