= Sample collection
As you would expect, not much secret here, we just dumped a 1 liter glass bottle with a rope attached around the neck in a few different locations of the river, and pulled it out with the rope.
And, in the name of science, we even wore gloves to not contaminate the samples!
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/3/33/River_water_sample_collection_swans.jpg/800px-River_water_sample_collection_swans.jpg]
{title=Swans swimming in the river when during sample collection}
{description=Swam poo bacteria?}
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/River_water_sample_collection_tie_rope_to_bottle.jpg/360px-River_water_sample_collection_tie_rope_to_bottle.jpg]
{height=400}
{title=Tying rope to bootle for river water sample collection}
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/River_water_sample_collection_get_sample.jpg/360px-River_water_sample_collection_get_sample.jpg]
{height=400}
{title=Dumping the bottle into the river to collect the water sample}
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/River_water_sample_collection_measure_temperature.jpg/360px-River_water_sample_collection_measure_temperature.jpg]
{height=400}
{title=Measuring the river water sample temperature with a <mercury thermometer>}
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/River_water_sample_collection_read_PH_strip.jpg/360px-River_water_sample_collection_read_PH_strip.jpg]
{height=400}
{title=Measuring the river water sample <pH> with a <pH strip>}
{description=The strip is compared with the color of a <mobile app> that gives the pH for a given strip color.}
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/River_water_sample_collection_identify_bottle.jpg/360px-River_water_sample_collection_identify_bottle.jpg]
{height=400}
{title=Noting sample collection location on the water bottle}
\Video[https://upload.wikimedia.org/wikipedia/commons/transcoded/b/bb/River_water_sample_collection_with_a_bottle_and_string.ogv/River_water_sample_collection_with_a_bottle_and_string.ogv.480p.vp9.webm]
{height=400}
{title=Dumping the bottle into the river to collect the water sample}
{description=That was fun.}