poster - International Conference of Agricultural Engineering

study, pore water was extracted by squeezing method which is quickly and effectively
according to the ASTM D4542.
Name
TABLE 1: Devices for collecting of pore water in soil
Squeezing device
Centrifuge Soil water extraction kit
(ASTM D4542)
Figure
2.3. Measurement of heavy metals content
The prepared samples of various types are measured heavy metals content which is
managed legally. The heavy metal items are measured are Cd, Cu, Pb, As, Zn, Ni, Hg, Cr+6.
The method to measure of heavy metal content is the inductively coupled plasma mass
spectrometer (ICP) method and the atomic absorption spectrometry (AAS) method. The
sequence of measurement is shown in Fig. 4.
FIGURE 4: The measurement process of heavy-metal concentration
3. Results and Discussion
The results of heavy metal content for each sample are shown in the following Table 2
As shown in the Table 2, the percentage of Zn, Cu, Pb and Ni was higher in common both
samples. The heavy metal contamination of the SW samples was higher than that of PH. In
particular, the concentrations of most heavy metals in SW were 2~6 times greater than those
of PH in soil particles. This is probably due to paddy site is located near metropolitan area
where is most likely to be polluted. On the other hand, the dilution water samples were below
detection limit for most heavy metals while the heavy metal concentrations of pore water
samples were detected above the detection limit. This may indicate that it is not appropriate
to use dilution water for the assessment of soil heavy metal contamination.