Summary for sodium orthophosphite Discussion
sodium orthophosphite is the key search term here, but the thread suggests there may not be an easy catalog source. Brendan Wallace, a MSc student at Imperial College London, asked where to buy sodium orthophosphite or get a CAS number for simulating spent electroless nickel bath conditions. Dave Wichern noted he did not know a vendor. Ken Vlach offered the practical workaround: make it by oxidizing sodium hypophosphite in aqueous solution, similar to orthophosphite formation during electroless nickel processing, and he warned that adding hydrogen peroxide can be vigorous and should be monitored by ORP; he also cautioned against excess peroxide because phosphate may form. He listed CAS numbers only for sodium hypophosphite, not orthophosphite. Guillermo Marrufo suggested an easier alternative: ask an electroless nickel vendor or local platers for spent solution and analyze it for the experiment.
2007
Q. To Whom it may concern,
I am a MSc. student in Imperial College London. I would like to get your assistance with something please?
I am carrying out some kinetic and parametric studies on spent electroless nickel plating baths. I would like to electrodeposit the spent solution in a moving bed electrode setup.
I am trying to simulate spent plating bath conditions with citrate as buffer and stabliser. I am using Nickel Sulphate as my nickel source and I need a source of ortho-phosphite. Short of carrying out an EN process can anybody recommend somebody I can purchase some sodium orthophosphite from? I have tried Sigma and JT Baker but they don’t seem to have ortho or dihydrogen phosphite in their online or manual indexes.
If at all possible I would like to get a CAS number?
Thank you for your help.
Brendan Wallace
Brendan John Wallace
MSc. Student – London, England
 | A. If you want my advice … Don’t waste time by messing around with “simulated” waste. Find some real EN waste, characterize it as best as you can, then do your experiments on that.
A. Don’t know any vendor for sodium orthophosphite. Make your own by oxidizing sodium hypophosphite in aqueous solution (similar to orthophosphite formation during EN). Adding hydrogen peroxide (careful, a vigorous reaction): Follow the course of the reaction via ORP during the peroxide addition. Basically a redox titration; the ORP will change from about an initial -500 mV @ pH 5 to 0 mV at the finish. Avoid using an excess of peroxide; phosphate may form. Ken Vlach [deceased]
– Goleta, California A. Just a thought. Wouldn’t it be much easier to ask for spent solution from a EN vendor? Then you can analyze and characterize it before using it in your experiment. I’m sure there will be platers in your area willing to give you any amount you will ever need. Guillermo Marrufo |
2007
Dear responders,
Thank you very much for getting back to me with your advice and information.
Best Regards,
Brendan John Wallace
– London, England