Distribution and factors affecting adsorption of sterols in the surface sediments of Bosten Lake and Manas Lake, Xinjiang
Jiang Liu, Xiaorui Yao, Jianjiang Lu*, Xiuwen Qiao, Zilong Liu, Shanman Li
School ofChemistry and Chemical Engineering, ShiheziUniversity, Key Laboratory for Green Processing of Chemical Engineering ofXinjiang Bingtuan, Shihezi, 832003, Xinjiang, China
*Corresponding author. Tel.: +86 993 2055016; fax: +86 993 2057270.
E-mail address: (J. Lu).
Supplementary materials
2.4. Adsorption material preparation
During the preparation of adsorbent, the supernatant was subjected to the same purification procedures as the samples. The testing resultsof thesupernatant and the repeated extraction times during the preparation of adsorbent are given in Table S1.
Table S1 Concentrations of sterols (μg·mL−1) in the supernatant and the repeated extraction times during the preparation of adsorbent
Repeatedtimes / COP / ECOP / CHOE / CHOA / CAM / STIG / STI / STAN
2 / 0.152 ± 0.003 / n.d. / 0.183 ± 0.008 / n.d. / 0.226 ± 0.004 / n.d. / 0.567 ± 0.011 / 0.237 ± 0.004
3 / n.d. / n.d. / n.d. / n.d. / n.d. / n.d. / n.d. / n.d.
Values shown are the average ± standard deviation of sterols in three replicates for each test
n.d.: not detected
Through adding different volume initial adsorption solution to the adsorbent, effects of sterol concentrations on the adsorption behaviours and sterol ratios can be investigated. Fig. S1 presents the effects of sterol concentrations on the adsorption behaviours and sterol ratios. The general trend was that Kds were increased with the increase of sterol concentrations. For most sterols, when the added volume of adsorption solution was 2 mL the changes of Kds were moderate compared with other added volume. Thus, 2 mL initial adsorption solution was chose to add into the adsorbent to investigated the adsorption behaviours of sterols.
Fig. S1Effects of sterol concentrations on the adsorption behaviours andsterol ratios
3.3. Factors affecting adsorption of sterols to surface sediment
In order to investigate the effect of the change of temperatrue on organic matter in aqueous phase, 10g ofadsorbentwas transferred into an Erlenmeyer flask and 50mL of ultrapure water was added. The flask was sealed and shaken at equal time increments (2h) within 48h.Different temperatures, particularly 4, 15, 22, 35 and 45°C, were set. Finally, the TOC in aqueous phase was determined by a TOC–V CPN (Shimadzu, Japan). The concentrations of TOC in aqueous phase at different temperature are given in Table S2. The concentration of TOC in aqueous phase was increased with the increase of temperature.
Table S2 Concentrations of TOC in aqueous phase at different temperatures
Temperature (°C) / 4 / 15 / 22 / 35 / 45TOC
(mg·L−1) / 0.82 ± 0.03 / 0.80 ± 0.01 / 0.94 ± 0.01 / 0.99 ± 0.02 / 1.08 ± 0.03
Values shown are the average ± standard deviation of TOC in three replicates for each test