Abstract Details
(2020) Trace Elements and REY in Bottom Seawater and Oxic Pore Water in NE Pacific: Pilot Study on the Application of a DGT Passive Sampling Method
Schmidt K, Paul S & Kriete C
https://doi.org/10.46427/gold2020.2308
The author has not provided any additional details.
14m: Plenary Hall, Tuesday 23rd June 22:27 - 22:30
Katja Schmidt
View all 2 abstracts at Goldschmidt2020
View abstracts at 11 conferences in series
Sophie Paul View all 2 abstracts at Goldschmidt2020 View abstracts at 5 conferences in series
Cornelia Kriete View abstracts at 3 conferences in series
Sophie Paul View all 2 abstracts at Goldschmidt2020 View abstracts at 5 conferences in series
Cornelia Kriete View abstracts at 3 conferences in series
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
Submitted by Mariko Hatta on Monday 22nd June 23:15
This is an interesting sampling platform. I would like to know if you already have this published. For the dissolved metal data in the water column, could you please explain what is your sampling frequency over the deployment?
The samplers were deployed in the water column for a period of 4 weeks . During this time, metals are continually accumulated, by steady state diffusion at the water-passive sampler interface (i.e., diffusion from high concentration to low concentration). Applying diffusion coefficients for the individual elements and and knowing the deployment time, one can calculate the average concentrations of (labile-bound) trace metals in the water during the time of deployment. We are about to publish this soon.
This is an interesting sampling platform. I would like to know if you already have this published. For the dissolved metal data in the water column, could you please explain what is your sampling frequency over the deployment?
The samplers were deployed in the water column for a period of 4 weeks . During this time, metals are continually accumulated, by steady state diffusion at the water-passive sampler interface (i.e., diffusion from high concentration to low concentration). Applying diffusion coefficients for the individual elements and and knowing the deployment time, one can calculate the average concentrations of (labile-bound) trace metals in the water during the time of deployment. We are about to publish this soon.
Submitted by Ed Hathorne on Tuesday 23rd June 09:40
Hi Katja. Very interesting but what do these units cost and how do you elute different parts of the strip inserted in the MUC sediments?
Hi Ed, after deployment, the 15 cm long stripes are cut into segments (in our case 0.1 cm to 2 cm segments), which are placed in eppies. We than added the elution solution (either HNO3 or NaOH). The costs vary between 70 Euro for the sediment stripes and 15 Euro for the single DGT devices for water applications.
Hi Katja. Very interesting but what do these units cost and how do you elute different parts of the strip inserted in the MUC sediments?
Hi Ed, after deployment, the 15 cm long stripes are cut into segments (in our case 0.1 cm to 2 cm segments), which are placed in eppies. We than added the elution solution (either HNO3 or NaOH). The costs vary between 70 Euro for the sediment stripes and 15 Euro for the single DGT devices for water applications.
Submitted by Brandy M Toner on Tuesday 23rd June 19:54
Dear Katja - Your audio didn't come through with your slides. Based on your abstract, could you explain what is meant by labile-bound chemical species? Are these sorbed to particles? best wishes, Brandy
Dear Brandy, passive sampler-labile species encompass the free ions and elements bound in complexes which dissociate fast at the interface of the passive sampler surface and seawater or in the diffusion layer (such as inorganic complexes). Organically complexed Cu is only weakly labile, as the complexes are very strong and don't dissociate easily. Labile-bound species may also be associated with colloids such as Fe oxyhydroxides or Mn oxides or bound to grain boundaries in the sediment, with dissociation initiated by passive sampler deployment.
Dear Katja - Your audio didn't come through with your slides. Based on your abstract, could you explain what is meant by labile-bound chemical species? Are these sorbed to particles? best wishes, Brandy
Dear Brandy, passive sampler-labile species encompass the free ions and elements bound in complexes which dissociate fast at the interface of the passive sampler surface and seawater or in the diffusion layer (such as inorganic complexes). Organically complexed Cu is only weakly labile, as the complexes are very strong and don't dissociate easily. Labile-bound species may also be associated with colloids such as Fe oxyhydroxides or Mn oxides or bound to grain boundaries in the sediment, with dissociation initiated by passive sampler deployment.
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