Backyard Aquaponics
A place to discuss aquaponics

That is still a bit low.

Ok - do a 1:10 dilution and you're measuring K+ with a range of 0-120, resolution of 1.0ppm

..
Does anyone know the chemistry of using Sodium Bicarbonate, as Ph UP..
I know it's generally frowned upon...

what happens to the Na, and thus what is the typical result..

This could influence just what needs being measured..
..
.

I don't know how soluble H2S is but could this be over come by completely filling the bottle?

Ah 1:10 or 1:9?

1 part in 10, or 1 part sample, 9 parts distilled water.

So 1:9?

yeh thats a confusing one, i believe they mean the same thing its all down to how you interpret it and however the majority of the population interprets it is right.

i would call it a 1 in 10 dilution and it could be written 1:10 meaning 1/divided by 10 so to speak in terms of your concentration. If its written in the way you would have to mathmatically go about re-correcting it then it makes more sense than being written in the physical method in which it is to be carried out ie. 1:9.

Yeah I think the difference is if you are talking 'Dilution factor' or 'dilution ratio'

Dilution Factor the colon is read as an 'in'
so 1:10 is one part in ten

Dilution Ratio the colon is read as 'to'
so 1:9 is one part TO nine parts (or one in ten still)

I agree with GMT, I think if ratio is not specified, factor is assumed.

and then of course there are the cases like alcohol, where mixing one part (volume) water to
9 parts (volume) alcohol don't add up to 10 parts volume of solution, all very confusing.

The difference is important to me at the moment because testing for nitrates my tap water has 20ppm so I have to take that into account when diluting 1:9.

I believe we are all talking about the same method of 1 part sample to 9 parts water just we arent quite on the same page with how it should be worded, either 1:9 or 1:10.

Should get some distilled water from the supermarket if your tap water is dubious, is $2 for 2L in cleaning isle last i remember.

i thought nitrites and nitrates in drinking water were actually quite bad for your health?

Depends on the concentration.

I hope not

i heard mainly for pregnant women, nitrite might cause some problems. anyway off topic.

Back on topic, im actually really keen for this service to happen because i have a use for it right now as i am struggling to pinpoint some deficiency issues that i believe are potassium and/or iron related. Unfortunately seeing the Hach one tests for ammonia, nitrite and nitrate just fine and thats all we need at work i cant convince my boss to get the YSI for potassium.

So lets get down to some nitty gritties. How much do you forsee yourself charging for labour? The hach tests for ammonia etc all have 15 minute reaction times that you have to wait for so the processes can be quite time consuming even though alot is sitting around waiting. I would assume YSI is much the same although for your sanities sake i hope they are shorter. If you get 2 people send in at the same time you should be able to do their tests side by side and use the same blank reagent test aswell saving a little bit of cash. That may be something to consider for your pricing aswell, the ammonia test in the hach machines you have to use 4 pillows of reagent 2 for sample and 2 for a pure water "blank" that it uses as zero point.

Did you really mean to call this thread "waster testin" Stu?

Oh hang on. Its not me its the forum. Its not displaying the full title