Often there is no choice but to store samples. It is a requirement of many experiments especially where the analysis cannot be carried out straight away. Unfortunately, if you store the sample incorrectly it will come out of storage different to how it was when it went it.
There are many definitions of a “blank”. The official definitions often say something like: a sample that includes everything that will be present in the samples of interest except the analyte of interest. However, this is not what the word blank is always used to refer to.
Conductivity of a solution appears a very simple measurement. Probe goes in, number comes out. Simple? While a number certainly comes out whether that number has any meaning requires slightly more careful handling.
To measure the uncertainty associated with a set of results you need to repeat measurements.
Accuracy: how close to the “true” value you are (e.g. how close to your true weight your bathroom scales weigh you to).
Your data may not fit your pet idea, or even the generally accepted scientific theory, but that does not they are wrong.
Meausring the carbon content of soils, sediments and rocks is a key measurement in geochemistry and other related sciences.
Although aqueous hydrofluoric acid is not a strong acid, it is very useful. Unfortunately, it is also very dangerous.
BET is one of the few methods available for surface area measurement and has the advantage of being able to give a measure of porosity.
Calibration standards are key to the analytical process as they are used to create the calibration curve. Better the calibration standards the better calibration curves and so the better the results.