- 1 What this is about
- 2 Drinking water
- 3 Water that was used for etching PCBs
- 4 Analysis
What this is about
This page is a collection of ideas & resources for DIY water analysis and treatment.
- Wikipedia: Drinking water – Definitions, statistics, links
- Competence center for drinking water at Eawag – Swiss Federal Institute of Aquatic Science and Technology
- Drinking water test kits
How do we know if it’s safe to drink? – Analysis
Does it look clear or muddy, coloured?
- look for particles (minerals, microplastic?) -> microscope?
- photometric -> green laser?
Does it contain “bad bugs”?
- simple bacterial testing (see card 7, “bad bugs”) http://www.waterscope.org
Does it contain harmful chemicals?
- lead, iron, copper
- chlorine and other water treatment chemicals
- pesticides and other agricultural chemicals
- salt -> conductivity
How can we make it safe to drink? – Treatment
- sterilise -> uv light, sunlight SODIS Solar Water Disinfection with PET bottles
What would a "minimal" water analysis and treatment kit look like to make drinking water from any water found?
The SGMK waterlab (/wetlab /aqualab?)
Water that was used for etching PCBs
How do we know if it’s safe to dispose of? – Analysis
How can we treat it so it's safe to dispose of? – Treatment
- iron sponge
Photometry is a common method in chemical analytics. The intensity the color of a dye is measured visually or by an technical equipment. These dye can be produced by chemical reaction of the analyte with a specific reagent. The amount of analyte in the solution is proportional to the intensity of the color.
Nitrat is a manure that is used in agriculture. Nitrat rich soils are fertile but can also pollute groundwater.
10 ml volumetric flask add - 9ml water - spatula zinc powder - 2 drops acetic acid 100% shake well add N=2 reagenz
add Nitrate standard shake well nitrate is reduced to nitrite and reacts to red color
When etching PCB waste with high copper concentration is produced. This waste is highly toxic to the aquatic environment. It is possible to remove the copper from the solution through a chemical process but the resulting solution has to be tested for remaining copper.
PAN solution 4x10-3 mol L-1
1 - (2-Pyridrylazo)- 2-naphthol
CuSO4 1g/l = 0.254 g/l Cu
In 10 ml Kolben geben
Solution with copper 1ml 4x10-3 mol L-1 PAN 0.1 – 2.0-mL of 0.2 mol L-1 sulfuric acid Fill uo to 10ml with Deion water
H2SO4 25%= 250g/l = 2.5 mol/l
add to 10ml volumetric flask
10 ml solution with copper (0.2 - 10 mg/l Cu) 1 T H2SO4 25% 0.1 ml PAN (5mg/10ml in Ethanol)