Voltammetric Determination of Iron - Metrohm

Application Bulletin 317/1 eVoltammetric Determination of IronPage 9/13Report of a Method 2 example « Seawater (low-nutrient)»======== METROHM 797 VA COMPUTRACE (Version 1.3.1.84) (Serial No. 1107) ========Determination : 0904291352_low nutrient seawater TEA++.dthSample ID : low nutrient seawater TEA++Creator method : Date : 2009-01-21 Time: 10:34:31Creator determ.: mk Date : 2009-04-29 Time: 13:52:38Modified by : --- Date : Time:--------------------------------------------------------------------------------Method: AB317_2 Det of Fe below 200 ppb.mthTitle: Determination of Fe (TEA method)Remark1 : 10 mL sample + 3 mL elect TEA+Remark2 : Electrolyte (0.05M TEA, 0.1M KBrO3, 0.3M NaOH)--------------------------------------------------------------------------------Sample amount : 10.000 mLCell volume : 12.000 mL--------------------------------------------------------------------------------Substance : FeConc. : 9.879 ug/LConc.dev. : 1.114 ug/L (11.28%)Amount: 118.546 ngAdd.amount : 250.000 ngVR V nA I.mean Std.Dev. I.delta Comments----- ------ ------ ------ -------- -------- ----------------------1 - 1 -0.890 -3.09 -3.08 0.025 0.001 - 2 -0.890 -3.062 - 1 -0.890 -8.59 -8.67 0.109 -5.592 - 2 -0.896 -8.743 - 1 -0.896 -15.05 -15.27 0.312 -6.603 - 2 -0.896 -15.49Substance Calibr. Y.reg/offset Slope Mean deviat. Corr.Coeff.------------ ------------ ------------ ------------ ------------ ------------Fe std.add. -2.904e-009 -2.940e-004 4.839e-010 0.99844Final results +/- Res. dev. % Comments----------------------------------- ------------------ -------------------Fe:Fe = 11.855 ug/L 1.337 11.281