Can someone plz tell me what is the answer for this question plz ?
Which of the following are common methods to ensure that analytical results are reliable and true?
Question 1 options:
-
Use of blank samples to ensure that any interferences in the sample or
in the procedure are acknowledged.
-
Spiking a sample with a known amount of an analyte allows an analyst
to check and confirm that their results are accurate.
-
Glassware is calibrated to ensure the exact amount of volume they
can hold and/or deliver.
-
All of the above
Which of the following are common methods to ensure that analytical results are reliable and true?
Question 1 options:
-
Use of blank samples to ensure that any interferences in the sample or
in the procedure are acknowledged. -
Spiking a sample with a known amount of an analyte allows an analyst
to check and confirm that their results are accurate. -
Glassware is calibrated to ensure the exact amount of volume they
can hold and/or deliver. -
All of the above
1 Answer
These are ALL important!
Options:
- Use of blank samples to ensure that any interferences in the sample or in the procedure are acknowledged.
This is used in UV-Vis spectroscopy all the time. You need a blank as a calibration standard, so you calibrate the spectrophotometer using DI water... that way, zero absorbance MUST correspond to zero solute concentration.
- Spiking a sample with a known amount of an analyte allows an analyst to check and confirm that their results are accurate.
You always want a concentration of a KNOWN inside a sample that contains a bunch of unknowns (for instance, Alaskan Amber beer has chloride, nitrate, nitrite, sulfate, citrate, etc), so that you can check whether your analytical tool was properly used. If you can't reproduce a known concentration, what hope do you have to get the unknown concentrations?
- Glassware is calibrated to ensure the exact amount of volume they can hold and/or deliver.
They'd better be! If you use an Erlenmeyer flask and try to declare you measured 100.00 mL, that would be entirely false because they do not have sufficient markings...
- All of the above
