We have previously discussed the process of collecting soil samples in this blog. However, what is the next best step after collecting those samples? Our goal is to analyze the soil samples for sulphur residues using chemical experiments. Initially, we conduct a hepar sample to qualitatively detect sulphur. Through testing, we have determined that a 1:10 ratio of sulphur in the soil will lead to a positive result using this method.
In a subsequent test, we mix the soil sample with diluted sulphuric acid and distilled water, then heat it. A positive result will produce gases such as sulphur dioxide, which have a distinct smell resembling rotten eggs. Additionally, it will cause a silver plate held over the test tube to change color from silvery to yellowish brown.
Further details about the experiments we conducted, including those tested with blank samples at school to ensure functionality, can be found in the Best-Of-video below regarding our 4-day experiment series. We thoroughly considered, experimented with, and critically evaluated various testing methods. As a result, we have created detailed test protocols of our experiments, which are included in the final report of our project which we submitted on last Sunday.
(author: Neele)