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Suitability Test

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Suitability Test Introduction My work is about a scenario where a building contractor that wishes to develop an area of land into new houses for families. The Environment Agency has been asked to check the land for contamination. My task is to decide which method of testing Ph values in soil is most suitable for an environmental scientist. The desirable characteristics should be: * Safe: So no one is harmed whilst using it. * Easy To Use: So its easier to carry out more than once * Accurate: So that the readings are reliable. * Light: So it is easy to carry around. * Portable: So that it is easy to transport around. * Durable: So it can last longer. * Small: So that it's easier to transport. * Cheap: So it saves money and is cost effective. * Energy Efficient: So it doesn't need a mains power supply. Evaluation RED= Poor ORANGE= Average GREEN= Good Cost Litmus U.I. ...read more.


Dip a piece of red and blue litmus paper into each dimple and watch for any colour changes. It was quite easy to do, but it was difficult to get equal amounts of soil by using a spatula, so it would be much more accurate if the soil was weighed out using something like scales or the pan balance. Method 2 - Universal Indicator Solution I put one large spatula of soil into the conical flask. I did one for Soil Sample A, one for B and one for C. I then added 2 spatulas of Barium Sulphate to the conical flasks. Next I added 80ml of distilled water to the flasks and placed the bung in the top. I shook the conical flasks, and left it to settle for 5 minutes. Using a pipette, I put approximately 1cm3 of the solution into each of the test tubes. To analyse, I compared the colour with the pH chart and recorded all the results in the table. ...read more.


Next I needed to filter the water and soil. To do this I put a piece of folded filter paper into a funnel and put the funnel above a glass. I poured the soil solution into the funnel and left it to drain into the glass. When it was all drained into the glass, I evenly spread the mixture among five boiling tubes. I was then ready to take the readings, but first the pH Probe needed calibrating. To do this, I submerged the end in pH7 buffer solution in the glass beaker. The probe should have a reading of pH7. I then rinsed it in distilled water before finally putting it in the first boiling tube and taking a reading. It then needed a rinse and clean. This was definitely the most confusing method of them all, and also the longest, and most expensive! It was very accurate but it's not Worthwhile using this method. If I was to choose a method I would choose the 2nd Method, the Universal Indicator solution as it is accurate and the most simple of the lot! ?? ?? ?? ?? ...read more.

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3 star(s)

Response to the question

The student has answered the question well, with the response being well laid out and easy to understand. By comparing the three methods side by side it helps the examiner see the reasoning behind the answer. The introduction gives a ...

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Response to the question

The student has answered the question well, with the response being well laid out and easy to understand. By comparing the three methods side by side it helps the examiner see the reasoning behind the answer. The introduction gives a clear reasoning behind the question and answer.

Level of analysis

The analysis of each of the methods is in depth. For a higher rating some of the steps could had been explained in greater detail, as it shows that you have a deeper understanding of what you are discussing. By having the quick analysis at the beginning of the results before the in depth analysis could be better for example instead of 'worst accuracy' you could say 'least accurate'. The final statement could also be more in depth as they say that it is the 'most simple of the lot!' but why was this the case, it is explaining your arguments that will gain you extra marks.

Quality of writing

The spelling and grammar of this essay are fine. It is the scientific language that could be improved, if you can think of a scientific word that you could use instead use it! It will help to convey your understanding of the subject.

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