Recent content by mpotocni

  1. M

    Digestion of Pb-alloy for ICP-OES analysis

    We still have to check interferences, but at first we wanted to find digestion procedure. Adding tartaric acid+nitric acid and then HCl seems to give good results. Thank you.
  2. M

    Digestion of Pb-alloy for ICP-OES analysis

    Thank you for response, I only have access to ICP-OES. Some company suggested that I use water: HNO3=1:1. I'll try and see what happens. With aqua regia we didn't get good results.
  3. M

    Digestion of Pb-alloy for ICP-OES analysis

    Thank you, yes, I don't want other analytes to precipitate. What do you think of these 2 procedures of digestion: 1. Tartaric acid+nitric acid 2. HCl Filter Lead precipitate. (will probably also other analytes precipitate or not?) Or: 1. Tartaric acid+nitric acid (A lot of lead? Any other...
  4. M

    Digestion of Pb-alloy for ICP-OES analysis

    Hello, I'm looking for these elements in approx. these concentrations: Ag 20 mg/kg Al 50 mg/kg As 10 mg/kg Bi 250 mg/kg Cd 90 mg/kg Cu 80 mg/kg Ni 2 mg/kg Sb 80 mg/kg Sn 450 mg/kg Te 200 mg/kg Tl 3 mg/kg Zn 70 mg/kg Ca 60 mg/kg Matrix is Pb, and I don't need the concentration of Pb. Thank you!
  5. M

    Digestion of Pb-alloy for ICP-OES analysis

    Thank you, I'll try. Sometimes we have problems with measurements of solutions with high content of Pb or some other elements. Intensities of internal standard decrease and during rinses don't increase again (to the level at the begining of the measurement). Thank you for help again.
  6. M

    Digestion of Pb-alloy for ICP-OES analysis

    Hello everybody, I am looking for a disgestion procedure of Pb-alloy, so that we can measure the elements with ICP-OES. Pb should be removed, that it doesn't contaminate the system. So far we used HCl for digestion, but the results weren't very good. Elements of interest are: Sn Sb Bi Cu Cd As...
  7. M

    Measuring flow rate (Doppler device)

    Simon, thank you for your answer! I hope that we will calculate properly now. If problems occur, I will ask for help again. Bye!
  8. M

    Measuring flow rate (Doppler device)

    Thank you very much for answer. If we can calculate the flow in this blocked pipe, how can we do it? Can you (or someone) please give me some link to equations or example? I tried to search, but didn't find any similar case. The pipe shape should be circular. Thank you for help!
  9. M

    Measuring flow rate (Doppler device)

    Hello, I am new in this field, so maybe my questions will be stupid :) sorry for that :) In the company where I work, they measure flow rates of wastewater using Flow meter (Doppler device). The problem is, that the flow rate is very low, so this device is not submerged completely in the...
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