Hi,
I usually place the 1ml syring with pink attachment below the liquid level then pull up and depress all before I fill to the 1ml mark including the air gap (I do not try to rid the syringe of the air bubble, and I get repeatable results) . I have been testing like this for years and it recently dawned on me that once I titrate the test I depress the remainder back into the bottle and chuck the syringe back into the box.
Is it at all plausible that the tiny bit of liquid still retained in the pink tip evaporates a bit and when retrieving the next amount in the manner I do above im returning the slightly evaporated liquid back into the bottle thus making the results skewed. The amount of liquid still in the tip could vary depending how often I use the kit.
Could this be the reason that guys get lower readings on newly opened kits and usually evaporation is usually offered as a possible reasons.
How do you guys do it?
I could rinse the syringes after every test but am I over thinking about this?
I usually place the 1ml syring with pink attachment below the liquid level then pull up and depress all before I fill to the 1ml mark including the air gap (I do not try to rid the syringe of the air bubble, and I get repeatable results) . I have been testing like this for years and it recently dawned on me that once I titrate the test I depress the remainder back into the bottle and chuck the syringe back into the box.
Is it at all plausible that the tiny bit of liquid still retained in the pink tip evaporates a bit and when retrieving the next amount in the manner I do above im returning the slightly evaporated liquid back into the bottle thus making the results skewed. The amount of liquid still in the tip could vary depending how often I use the kit.
Could this be the reason that guys get lower readings on newly opened kits and usually evaporation is usually offered as a possible reasons.
How do you guys do it?
I could rinse the syringes after every test but am I over thinking about this?