This report was prepared as an account of work sponsored by an agency of the U n i t e d States Government. Neither the U n i t e d States Government nor any agency thereof, nor Battelle Memorial hstitute, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accura& completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not lnfringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or-otherwise does not necessarily constitute or imply its endorsement, mmmendatiG, or favoring by the U n i t e d States Government or any agency thereof, or Battelle Memorial Institute. The views and opinions of authors expressed herein do not necessarily state or reflect those of the U n i t e d States Government or any agency thereof.

The contact time was extended to 1 week to ensure equilibrium was attained.

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