-
- Posts: 9
- Joined: Sun Mar 05, 2017 6:05 pm
I have put in operation ICS900 unit that stood off for few years. Previous operators were determining the rain on it.
On anion unit I cannot detect posphates and sulphates - I can see those peaks but they are stretched over for some 6 mins in concentrations of 50ppm. If I run 10ppm standards, I cannot see them at all.
I'm using AS14 column, AMMC 300 suppressor and eluent is 3.5mM Na2CO3/1mM NaHCO3. The flow is 1.5ml/min and regenerant is 25mN H2SO4. The conductivity of the eluent is 25uS/cm.
I have regenerated the suppressor (250mM H2SO4) and I have put the column the opposite way and put 10 times higher conc of the eluent through it.
By the specs the eluent conductivity should be 16-18uS/cm, and then, hopefully I could resolve the peaks, but I cannot get that low conductivity. Does anybody have any idea how to achieve that low conductivity and why do I get so stretched PO4 and SO4 peaks?
Thanks!