Supplementary information for
Insight into the unique oxidation chemistry of elemental mercury by chlorinecontaining species: experiment and simulation
Youngchul Byun,† Moohyun Cho,† Won Namkung,† Kiman Lee,‡ Dong Jun Koh‡
and Dong Nam Shin‡*
†
School of Environmental Science and Technology, Pohang University of Science and
Technology (POSTECH), San 31 Hyoja-dong Nam-gu Pohang 790-600. Republic of Korea
‡
Environmental Research Department, Research Institute of Industrial Science & Technology
(RIST), San 32 Hyoja-dong Nam-gu Pohang 790-600. Republic of Korea
*Corresponding
author
telephone:
+82-54-279-6540;
fax:
+82-54-279-6239;
e-mail:
[email protected]
Contents
Contents
Title
Page
Text
Illustration of experimental setup
S1
Figure S1
Schematic diagram of the experimental system.
S3
Illustration of experimental setup
The experimental setup consists of a gas feeding system, a set of reactors and gas
analyzers (Figure S1).
All of the experiments were conducted at atmospheric pressure.
The flow rates of simulated gases were controlled using a set of mass flow controllers
(MFC, Brooks 5850E). Portions of N2 gas passed through two stages of mercury
saturators and then mixed with buffer air to prepare the simulation gas stream
comprising the desired concentration of mercury.
S1
Mercury saturators were immersed
in a temperature-controlled digital oil bath (VWR Scientific Model 1156) and the
temperature of bath was kept at 20 ± 0.1 oC. Such a fluctuation in mercury saturator
about ± 0.1 oC results in the error of Hg0 concentration about ± 3 µg m-3 in the final gas
mixture. The mercury saturators consist of a 100 mL gas washing Pyrex bottle filled
one sixth full with a pool of mercury, and a 100 cm long Teflon tube to prevent the oversaturation of mercury vapor.
After leaving the saturators and mixing with N2, a certain
concentration of mercury can be kept constant in the plasma reactor regardless of the
temperature of the reactor containing NaClO2(s).
The equipment has been constructed
without metal parts, except for the electrodes of the plasma reactor, to prevent
dissolution of mercury into the metal. The Hg0 concentration was measured by cold
vapor atomic absorption spectrometry (CVAAS) and other species were monitored
using Fourier transform infrared (BIO RAD).
avoid condensation.
S2
The FTIR cell was heated to 80 oC to
Experiment set 1
NO
N2
Mercury
Mixer
N2
Temperature-controlled
NO2
Mixer 1
Mercury analyzer (CVAAS)
Mixer 2
NaClO2(s)
FTIR
NO
Furnace
NaClO2
N2
Experiment set 2
Mercury
FIGURE S1. Schematic diagram of the experimental system.
S3