| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Dep. of Soil Science, Univ. of Wisconsin, Madison, WI 53706-1298. Research supported by the College of Agricultural and Life Sciences and Timco Manufacturing.
ABSTRACT
The adsorption of trace metals on ceramic, polytetrafluoroethylene (PTFE or Teflon), fritted glass, and stainless steel vacuum pore-water samplers and silica packing material used to seat samplers was evaluated with respect to potential sampling errors. A solution containing radio-labeled Cd+2, Co+2, Cr+3, and Zn+2 and a mix of ions typically found in soil solutions was used to assess specific absorption of inorganics to porous cups of samplers and to silica. Four sets of samplers were cleaned with acid or water and then treated with a solution containing trace metals at concentrations near primary or secondary drinking-water standards or one order of magnitude lower for 2 or 7 d. After treatment, the samplers were rinsed with 10 or 30 pore volumes (PV) of simulated soil solution and radioassayed. Duplicate silica samples were treated with the high-trace-metal solution adjusted to a pH of 4, 6, or 8 for a 5-d period, rinsed with simulated soil solution, and radioassayed. Adsorption was greatest on samplers treated with high trace-meal concentrations and samplers cleaned with water. Desorption of both Co and Zn occurred with the 30-PV soil solution rinse for all sampler types except stainless steel. The general pattern of metal adsorption on samplers was ceramic > stainless steel >> fritted glass = PTFE. The general order that trace metal adsorbed to samplers and silica was Zn >> Co > Cr > Cd. At pH values of 6 to 8, trace-metal adsorption on silica (mass of adsorbent/mass of adsorbate) was similar to or greater than that observed for ceramic samplers. This study shows that adsorption-desorption processes can cause sampling error when analysis of trace metals at microgram-per-liter concentration levels is necessary.
Received for publication December 10, 1990.
This article has been cited by other articles:
|
|
 |
|
  D. Rais, B. Nowack, R. Schulin, and J. Luster Sorption of Trace Metals by Standard and Micro Suction Cups in the Absence and Presence of Dissolved Organic Carbon J. Environ. Qual., January 3, 2006; 35(1): 50 - 60. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. Weihermuller, R. Kasteel, J. Vanderborght, T. Putz, and H. Vereecken Soil Water Extraction with a Suction Cup: Results of Numerical Simulations Vadose Zone J., September 12, 2005; 4(4): 899 - 907. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M.K. Andersen, K. Raulund-Rasmussen, B.W. Strobel, and H.C.B. Hansen Adsorption of Cadmium, Copper, Nickel, and Zinc to a Poly(tetrafluorethene) Porous Soil Solution Sampler J. Environ. Qual., January 1, 2002; 31(1): 168 - 175. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Crop Science | |||
| Vadose Zone Journal | Journal of Plant Registrations | ||||
| Journal of Natural Resources and Life Sciences Education |
Journal of Environmental Quality |
||||
