help with Hanna phosphate checker

[straightrazorguy]

Originally Posted by Amadod2

when i do my first reading i get .17 and the next two i get .10, im just wondering if any of you use a hanna checker and what is the most accurate way of using it

It could be that the reagent powder isn't completely dissolved for your first reading. It takes me a few minuted to get all the floaties dissolved...

Either way, in the grand scheme of things, the difference between 0.10 and 0.17 isn't the end of the world. Or is it?

[Amadod2]

well im trying to get my water to .05, i have also read that you shouldn't have any air bubble in the vile.

3min seems to be a bit much it terms of the sample diluting, it takes at least that long to get it to dissolve

[toytech]

Get a small piece of wax paper and pour the regent onto it then into the vial , its too hard to get it all out of the package any other way . I add it to the vial then shake for a minute to a minute and a half max . I also make sure to clean the vials right after use with ro water . I get quite consistant readings this way.

[monza]

Originally Posted by toytech

Get a small piece of wax paper and pour the regent onto it then into the vial , its too hard to get it all out of the package any other way . I add it to the vial then shake for a minute to a minute and a half max . I also make sure to clean the vials right after use with ro water . I get quite consistant readings this way.

I think thats a good tip with the wax paper, Im going to try that because its so hard to get it all from packet and not spill some. And 2X on washing with RO water, also a little drying stand works great. Think wine decanter drying stand...

[lastlight]

i cut the top off and then tear one side all the way open so I can spread the packet more. then i do the tap and i can get very close to all of it into the vial. it's still quite a pain tho i'm going to try the wax paper idea.

[straightrazorguy]

Originally Posted by Amadod2

well im trying to get my water to .05, i have also read that you shouldn't have any air bubble in the vile.

3min seems to be a bit much it terms of the sample diluting, it takes at least that long to get it to dissolve

I know, but the difference between 0.10 and 0.17 puts it in the same ballpark. It's not an order of magnitude difference.

Where did the 3 minute rule come from? It takes me longer than 3 minutes to dissolve all the reagent floaties.