Fast Determination of Dissolved Oxygen by Counting Drop of Capillary Burette Micro Titration

Fast determination of dissolved oxygen was performed by counting drop of capillary burette microtitration.The results showed that the uncertainty(Urel) of the method was about 1.6%,an equivalent value to the conventional titrimetric analysis and is conformed to national standards.A polyethylene capillary burette with the single drop volume of 0.01~0.02 mL was used for the microtitration and the possible error resulting from the keeping and transportation of the water samples could be avoided.The apparatus is small,portable,the titration process is rapid and only 65~100 drops of titrant is needed,which would satisfy the requirements of spot analysis and rapid monitoring of water samples.