It’s calibration time!

For most measurements in analytical chemistry some form of calibration curve is required. The better the calibration the more accuracy and precise are the results that you can achieve.

Analysis procedure

Analyse this!

When you run an analysis there is a procedure you need to follow to ensure you get the best data.

A simplified schematic of the DI water process.

Laboratory water

From a laboratory scientist point of view, the water we drink it is dirty. In a laboratory we need get our water closer to the school ideal of H2O (pure water).

LOD from signal-to-noise ratio

How low can you go? A practical guide to the Limit of Detection

Before you chose a piece of equipment or experimental method you need to ensure that it can detect the thing you want to measure (analyte) in the concentrations present. For example, can your method detect 1ppb phosphate in sea water? If you can’t measure it then there is no point in making, or collecting, it!

Excel and statistics for physical scientists

While Excel is anything but ideal for use in statistical work it can do many amazing things. However, it can be quite opaque as to what is actually happening and difficult to find the correct function. For this reason I have picked out the key functions for the statistical analysis discussed here.

Choosing a SignificanceTest.

Significance tests

In an experiment you may hypothesize there is a relationship between two values or two sets of values. To ensure that relationship is robust you need carry out a test of the significance of that hypothesized relationship.

The analytical balance.

The laboratory balance: a practical guide

The laboratory balance is so often the forgotten object that sits in the corner of the laboratory. Forgotten, that is, until it is called on to give an accurate measurement. There are few things more frustrating than a balance that is not behaving itself and usually this is due to neglect.