Databank

Databank

Posiva publishes Working Reports and Posiva Reports. From the year 2006 nearly all the reports have been published on our webpage and they can be found in the databank. In the databank you can also find our Annual Reviews and some other publications as well. You can also find print-quality pictures and useful links in the databank.

Recent publications


Workreport 2019-8

Back

Name:

Follow-Up Study of the Humic Substances and Colloidal Material in Groundwater from ONKALO, Olkiluoto, 2017

Writer:

Luste, S.

Language:

English

Page count:

30

Summary:

The humic substances (HS) at groundwater from ONKALO®, Olkiluoto were studied in order to determine the apparent molecular size distribution and the amount of humic substances and to compare the results with the previous years’ results. Groundwater samples were taken from the groundwater stations ONK-PVA3, ONK-PVA5 and ONK-PVA10. Humic substances were isolated and molecular size distribution was determined using high resolution size exclusion chromatography (HPSEC) method optimized during previous years. The amount of humic substances was determined by total organic carbon analyser (TOC). In addition, metal content of initial and isolated humic fraction was studied. The results of both molecular size distribution and amount of humic substances were similar with previous studies.

In addition to HS also a study related to colloids was performed. The purpose of this study was to estimate the concentration of groundwater colloids and to compare the results with the previous ones. The water samples were collected from groundwater stations ONK-PVA5, ONK-PVA10 and ONK-PVA11.

The colloid concentrations were determined from scanning electron microscopy (SEM) micrographs taken from the filters in which the groundwater was run through. The particle calculations were performed with computer software ImageJ. The colloid concentration (Ø 0–1 µm) determined by the single particle analysis of SEM micrographs was somewhat higher in ONK-PVA5 and ONK-PVA10 compared to previous study. Colloids could not be evaluated from ONK-PVA11 since the filter used for sampling was blocked due to long sampling time.

Keywords:

DAX-8, colloids, fulvic acids, groundwater, humic acids, HPSEC, SEM

File(s):

WR 2019-08_web (pdf) (1.3 MB)


Back


Share article:
This website stores cookies on your computer. These cookies are used to improve our website and provide more personalised services to you.
Close

Cookies

To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

1. What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

2. How do we use cookies?

A number of our pages use cookies to remember your actions and preferences (such as login, language, font size and other display preferences.)

Also, some videos embedded in our pages use a cookie to anonymously gather statistics on how you got there and what videos you visited.

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.

The cookie-related information is not used to identify you personally and the pattern data is fully under our control. These cookies are not used for any purpose other than those described here.

3. How to control cookies

You can control and/or delete cookies as you wish – for details, see aboutcookies.org. You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.

Close