All issues
Successor
Volume 43 (1997)
- Issue 6 Pages 317-
- Issue 5 Pages 251-
- Issue 4 Pages 203-
- Issue 3 Pages 145-
- Issue 2 Pages 69-
- Issue 1 Pages 1-
Volume 43, Issue 4
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
Masaru TANAKA1997 Volume 43 Issue 4 Pages 203-208
Published: August 31, 1997
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSIncineration carries significant weight in waste disposal in general. Seventy-five percent of the total quantity of municipal solid waste (MSW) is incinerated. In the year 1994, there were a total of 1854 incineration plants for MSW and 3376 incineration plants for industrial waste in Japan. But air pollution by exhaust substances -especially dioxin- from incineration plants poses a problem. This may place a big hurdle before future incineration plant projects. The study team on the risk assessment set by the Ministry of Health and Welfare (M.H. & W.) proposed 10 pg-Toxic Equivalents (TEQ) /kg/d as a Tolerable Daily Intake (TDI) for PCDDs/PCDFs in June 1996. And the study team on risk assessment set by Environment Agency proposed 5 pg-TEQ/kg/d as a risk assessment reference value for PCDDs/PCDFs in December 1996. These figures are obtained by dividing No Observed Adverse Effect Level (NOAEL) value (1 ng-TEQ/kg/d) by uncertainty factors 100 and 200, respectively. Exposures of PCDDs/PCDFs to the human and health risk are discussed here.View full abstractDownload PDF (696K) -
Nobuyasu YAMAGUCHI, Hiroshi OHMORI, Nihal WELIKALA, Masao NASU1997 Volume 43 Issue 4 Pages 209-214
Published: August 31, 1997
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSBiodegradation of selected chemical compounds was examined by a modified river die-away test called TOC-HANDAI. This method enables site-specific estimations of the biodegradation of chemical compounds in river water. It also can be used in conjunction with other standard water quality parameters to predict the degree of water pollution.View full abstractDownload PDF (670K) -
Tamihide MATSUNAGA, Masae ANO, Kazuhito WATANABE, Ikuo YAMAMOTO, Hidet ...1997 Volume 43 Issue 4 Pages 215-220
Published: August 31, 1997
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSTwo peaks corresponding to authentic p-coumaroyltyramine (p-CT) and trans-feruloyltyramine (trans-FT) were detected on the HPLC chromatogram in the extract of cannabis seeds, whereas these peaks were not detected in the extracts of plant seeds of Japanese radish, radish or spinach. A part of trans-FT was converted to a cis-isomer by ultraviolet irradiation. The contents of p-CT and trans-FT were 0.2-1.3 and 5.1-26.8 mg/100 g of the seeds, respectively. These results indicate that the detection of p-CT and trans-FT in plant seeds by HPLC analysis is a useful method for the discrimination of cannabis seeds from other plant seeds.View full abstractDownload PDF (577K) -
Yoshichika HIRAHARA, Katsuhiko NAKAMURO, Yasuyoshi SAYATO1997 Volume 43 Issue 4 Pages 221-229
Published: August 31, 1997
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSIn order to know behaviors of pesticides in the environment, changes in residual patterns of 35 organophosphorus, 28 organonitrogen, 9 organochlorine and 7 pyrethroid pesticides after boiling and heating, and by alterations in pH were investigated. A high correlation between the solubility of water and the residual percentage of pesticides 30 min after boiling at 100°C was recognized, and a similar relation was also detected between the vapor pressure and the residual percentage of pesticides 30 min after heating. With an alteration in pH, it is suggested that formotion, chinomethionat, bendiocarb, cypermethrin, fluvalinate and fenvalerate were hydrolyzed in alkaline conditions. And also carbosulfan and amitraz were hydrolyzed in acidic conditions. But 71 in 79 kinds of pesticides did not decompose from pH 6 to 10. It was identified by GC-MS that carbosulfan was decomposed into carbofuran by the acidic hydrolysis.View full abstractDownload PDF (943K) -
Mariko TACHIKAWA, Ayako MATSUNO, Masakatsu TEZUKA, Ryoji SAWAMURA1997 Volume 43 Issue 4 Pages 230-236
Published: August 31, 1997
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSInactivation rates for poliovirus (Lsc, 2ab strain), suspended in a phosphate buffer salt solution (PBS) and a cell maintenance medium (MEM), with chloramines, N-chlorosuccinimide (Cl-SI), chloramine T (Cl-T), ammoniamonochloramine (NH2Cl), N-chlorodiethylamine (ClDEA) and N-chloroglycine (Cl-Gly) at 2 and 10 mg/l as available chlorine (Cl2), were determined at pH 7 and 20°C. Inactivation efficacies of these chloramines were compared each other and discussed in relation to chemical potency, hydrolysis constants and chlorination rates for the chloramines. At 10 mg/1 as Cl2, the periods for the 99% inactivation of the virus suspended in PBS with Cl-SI, Cl-T, and NH2Cl were 2.5, 5, and 5 min, respectively. However, Cl-DEA and Cl-Gly did not reach 99% inactivation in 10 min contact. There were a little chlorine consumption in the test solutions of Cl-SI, Cl-T, and NH2Cl but of Cl-DEA and Cl-Gly. The inactivation efficacies of these chloramines did not correspond to the order of their hydrolysis constants. The faster chlorination rate for Cl-SI than tested other chloramines may have an influence on its faster inactivation rate. Inactivation rates for the virus suspended in MEM with the chloramines were slower than that for the virus suspended in PBS. It might be due to the formation of less effective chloramines from constituents in MEM virus suspension.View full abstractDownload PDF (799K) -
Harumi OSHIMA, Mitsuaki SANO, Fusao USHIO, Norihisa KAWAMURA, Sadaji Y ...1997 Volume 43 Issue 4 Pages 237-242
Published: August 31, 1997
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSA simple and rapid method for the determination of heme iron in foods was investigated. A sample was weighed in a centrifuge tube and the fat in the sample was removed with diethyl ether. The residue was mixed well with 1-2 ml water, and added 10 ml of methyl isobutyl ketone (MIBK) and 5 ml of concentrated hydrochloric acid. The tube was placed in an ultrasonic water bath for 10 min. Five ml of water was added to separate the MIBK layer from the aqueous layer. After shaking for 5 min, the mixture was centrifuged for 5 min at 3000 rpm. Heme iron in the MIBK layer was determined by spectrophotometer at a wavelength of 640 nm. The calibration curve was linear from 2.5 to 15μg Fe/ml. The recoveries of heme iron added to foods were within the range from 80.5% to 90.0%. An interlaboratory study of this method for the determination of heme iron in cookie, liver and meat was conducted in 3 laboratories. The coefficient of variation for each sample was within the range of 6.29-7.15%. This method is simple and useful for the determination of heme iron in foods.View full abstractDownload PDF (715K) -
WonTae JUNG, SungKu KIM, KyoungJune LEE, DongHuhn SOHN1997 Volume 43 Issue 4 Pages 243-250
Published: August 31, 1997
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSA method of multi-element determination of hazardous heavy metals such as Cd, Cu and Pb in the water of the Han River is described in this paper. The liquid-liquid extraction (LLE) methods using N, N'-diethyldithiocarbamate-methylisobutylketone (DDTC-MIBK) and ammonium pyrrolidine dithiocarbamate-methylisobutylketone (APDC-MIBK) were compared by flame atomic absorption spectrometry (FAAS). For quantitative analysis, DDTC-MIBK extraction was adopted due to its good recoveries (average 93.0% for 3 elements), detection limits (3.4-18.6 ng/l), repeatability (C.V. 1.13-4.57%) and accuracy (average 97.5%). The multi-element determination was available because no interference effect was observed on 3 kinds of metal coexisting in an aqueous matrix. The heavy metal concentrations in the aqueous samples collected from 12 separate points of the Han River averaged 4.204 ppb for Cd, 8.563 ppb for Cu and 2.462 ppb for Pb, respectively. Cd existed almost in suspended particles in water, Cu existed half in suspended particles and half in dissolved form and Pb was almost completely found in particles and only 7% in dissolved form.View full abstractDownload PDF (779K)
- |<
- <
- 1
- >
- >|