Abstract
BACKGROUND: Silicon tetrachloride reacts with moisture in the atmosphere to generate hydrogen chloride, which affects the environment. Since silicon tetrachloride and its by-products are dispersed in the atmosphere in a short time after the silicon tetrachloride release into the atmosphere, it is difficult to directly assess the extent of environmental impact. In the present study, the exposure test of silicon tetrachloride or hydrogen chloride was examined in order to establish the criterion of the range affected by the silicon tetrachloride release, and the actual crops in the area exposed to silicon tetrachloride leakage were analyzed. METHODS AND RESULTS:For the experiment of exposure to silicon tetrachloride or hydrogen chloride, the leaves of red-pepper and corn were used in glass sealed containers. In the actual accident area, 59 samples from 10 different kinds of crops were collected. The pretreatment of the sample was performed by freezing and grinding, and then extracted using distilled water. The pH and concentration of chloride (Cl -) ion of the extracted solution were measured using pH meter and ion chromatograph, respectively. CONCLUSION: Exposure to silicon tetrachloride caused visible damage, increasing the concentration of chloride ion, and decreasing the pH as well as hydrochloric acid. In the actual crops of the affected area, the tendency was the same as the result of the laboratory test, and the range of influence could be estimated through the concentration of Cl -ion over 2,000 mg/kg, and the correlation evaluation between the concentration of Cl -and pH. Therefore, the concentration of Cl -ion and the correlation between Cl -and pH would be considered as the factors to estimate the influence range of silicon tetrachloride release.
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Claims 5
Claim · model-written summary
Exposure caused visible crop damage.
- Taxon
- red-pepper and corn
Capsicum annuum var. annuum
Zea mays subsp. mayse1 - Treatment
- silicon tetrachloridee0
- Outcome
- visible damagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to silicon tetrachloride caused visible damage”
e1“leaves of red-pepper and corn”
Claim · model-written summary
Exposure increased crop chloride ion concentration.
- Taxon
- red-pepper and cornCapsicum annuum var. annuumZea mays subsp. mayse1
- Treatment
- silicon tetrachloridee0
- Outcome
- concentration of chloride ione0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to silicon tetrachloride caused visible damage, increasing the concentration of chloride ion”
e1“leaves of red-pepper and corn”
Claim · model-written summary
Exposure decreased crop extract pH.
- Taxon
- red-pepper and cornCapsicum annuum var. annuumZea mays subsp. mayse1
- Treatment
- silicon tetrachloridee0
- Outcome
- pHe0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to silicon tetrachloride caused visible damage, increasing the concentration of chloride ion, and decreasing the pH”
e1“leaves of red-pepper and corn”
Claim · model-written summary
Crops in the accident area showed the same trend as the laboratory test.
Verbatim
e0“In the actual crops of the affected area, the tendency was the same as the result of the laboratory test”
Claim · model-written summary
Chloride above 2,000 mg/kg and its correlation with pH could estimate the affected range.
Verbatim
e0“the range of influence could be estimated through the concentration of Cl -ion over 2,000 mg/kg, and the correlation evaluation between the concentration of Cl -and pH”
e1“actual crops of the affected area”
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