need help with orp calibration

[phuochai]

can any one help me to calibration neptune ORP probe
in the instruction book say that i need created a saturated solution of quinhydrone with PH 4 and another solution of quihydrone with PH 7 to calibration me ORP probe
my question is: where can i buy sone quinhydrone , do neptune sell them?
I buy some redox solution ( Milwaukee ) ( MA 9020 for platinum and gold electrodes 200 to 275 mV @ 77F ) contents: potassium hydrogen phthalate 877-24-7, quinhydrone106-34-3. is this solution can use to calibration out probe ? and if yes then what is the percent can i mix ( how much MA 9020 to how much PH4 or PH7 ?
thank for all your help
sorry i don"t understand the word saturated i think my english is not good

 

[dhoch]

quinhydrone is actually a black powder... search here or online and you should find some references to buying it.

THere is a kit you can buy... $50 or $60 that contains all you need (expensive, but it'll last you a while).

Saturated means "will absorb no more" (so when your solution can absorb no more quinhydrone it is saturated)

Dave

 

[phuochai]

Dave thank you for your help. i found some quinhydrone from
http://exoticfish.com/details.cfm?c...e=normal&&9839DC89-D613-74CF-4D4E6B6D351D4179