OBJECTIVETo calculate the consequence of acute ammonia poisoning accident which was caused by the leak of liquefied ammonia storage tank, so as to provide theoretical basis for working out the counterplan of accidents.

METHODThe amount of liquefied ammonia to be reserved, the pressure and temperature inside the tank were inputted; based on the physical chemistry principle, the evaporating amount was calculated; and using the proper diffusion model, the size of ammonia cloud, percentages of death and depth range of the poisonous gas etc was calculated.

RESULTSAssuming the leaky tank had liquefied ammonia 50 t, the pressure and the temperature were 2.5 MPa and 30 degrees C respectively, the evaporating amount and the size of ammonia cloud were calculated. The radiuses, of the ammonia released cloud of severe, moderate and mild hazard were 108 m, 216 m, 370 m respectively; if the exposured time was 30 min, the percentage of death would be 50%; if the exposured time was 5 min, the percentage would be 10%; if the exposured time was 2 min, the percentage would be 2.5%. When the stable degree of circumstance was C, the wind speed was 2.3 m/s and the outside concentration of the cloud was 4000 mg/m3, dimension of cloud in X axis was 782 m and in Y axis was 88 m.

CONCLUSIONThe leaky consequence of liquefied ammonia was very serious. It is necessary to take preventive measures during production, storage, transportation and using of liquefied ammonia.

Accidents, Occupational ; prevention & control ; Ammonia ; analysis ; poisoning ; Humans ; Pressure ; Temperature

BACKGROUND: The ammonia contained in tobacco fillers and mainstream and sidestream cigarette smoke accelerates nicotine dependence in cigarette smokers. Ammonia has been included in the non-exhaustive priority list of 39 tobacco components and emissions of cigarette published by the World Health Organization (WHO) Study Group on Tobacco Product Regulation. The development of a simple ammonia detection method will contribute to the establishment of tobacco product regulation under tobacco control policies and allow surveys to be conducted, even by laboratories with small research budgets. METHODS: We developed a simple colorimetric method based on the salicylate-chlorine reaction and absorption spectrometry with two reagents (sodium nitroprusside and sodium dichloroisocyanurate). To compare this method to conventional ion chromatography, we analyzed the ammonia levels in tobacco fillers extracted from 35 Japanese commercially marketed cigarette brands manufactured by four tobacco companies (Japan Tobacco (JT) Inc., British American Tobacco (BAT), Philip Morris Japan, and Natural American Spirit). We also analyzed the ammonia levels in the sidestream smoke from cigarettes of the brands that were found to contain high or low tobacco filler ammonia levels. RESULTS: The ammonia levels in the reference cigarette (3R4F) measured by our method and ion chromatography were similar and comparable to previously reported levels. The ammonia levels in tobacco fillers extracted from 35 cigarette brands ranged from 0.25 to 1.58 mg/g. The mean ammonia level of JT cigarette brands was significantly higher (0.83 ± 0.28 mg/g) than that of Natural American Spirit cigarette brands (0.30 ± 0.08 mg/g) and lower than those in the other two cigarette brands (1.11 ± 0.19 mg/g for BAT and 1.24 ± 0.15 mg/g for Philip Morris) (p < 0.001 by Bonferroni test). The ammonia levels in the sidestream smoke of CABIN, Marlboro Black Menthol, American Spirit Light, and Seven Stars were 5.89 ± 0.28, 5.23 ± 0.12, 6.92 ± 0.56, and 4.14 ± 0.19 mg/cigarette, respectively. The ammonia levels were higher in sidestream smoke than in tobacco filler. CONCLUSIONS Our simple colorimetric could be used to analyze ammonia in tobacco fillers and sidestream smoke. There were significant differences between the ammonia levels of the 35 commercially marketed cigarette brands in Japan manufactured by four tobacco manufacturers. Over 90% of the ammonia in sidestream smoke was in gaseous phase.
Ammonia ; analysis ; Colorimetry ; methods ; Japan ; Smoke ; analysis ; Spectrophotometry ; methods ; Tobacco ; chemistry ; Tobacco Products ; analysis

PURPOSE: We evaluated the feasibility of extracting pure left ventricular blood pool and myocardial time-activity curves (TACs) and of generating factor images from human dynamic N-13 ammonia PET using factor analysis. The myocardial blood flow (MBF) estimates obtained with factor analysis were compared with those obtained with the user drawn region-of-interest (ROI) method. MATERIALS AND METHODS: Stress and rest N-13 ammonia cardiac PET imaging was acquired for 23 min in 5 patients with coronary artery disease using GE Advance tomograph. Factor analysis generated physiological TACs and factor images using the normalized TACs from each dixel. Four steps were involved in this algorithm: (a) data preprocessing; (b) principal component analysis; (c) oblique rotation with positivity constraints; (d) factor image computation. Area under curves and MBF estimated using the two compartment N-13 ammonia model were used to validate the accuracy of the factor analysis generated physiological TACs. The MBF estimated by factor analysis was compared to the values estimated by using the ROI method. RESULTS: MBF values obtained by factor analysis were linearly correlated with MBF obtained by the ROI method (slope=0.84, r=0.91). Left ventricular blood pool TACs obtained by the two methods agreed well (Area under curve ratio: 1.02 (0~1 min), 0.98 (0~2 min), 0.86 (1~2 min)). CONCLUSION:: The RESULTS of this study demonstrates that MBF can be measured accurately and noninvasively with dynamic N-13 ammonia PET imaging and factor analysis. This method is simple and accurate, and can measure MBF without blood sampling, ROI definition or spillover correction. KW: N-13 ammonia, PET, Myocardial blood flow, Factor analysis
Ammonia* ; Area Under Curve ; Coronary Artery Disease ; Factor Analysis, Statistical* ; Humans ; Principal Component Analysis

OBJECTIVETo establish an ion chromatography (IC) method for determination of ammonia in air of workplace.

METHODSAmmonia in workplace air was collected in silica gel tube, desorbed with 10 mmol/L methanesulfonic acid by ultrasonic for 10 min, determined by IC.

RESULTSThe linearity range was 0.02-1.00 microg/ml. The linear equation was Y = 12041X-187 (r = 0.9997). The limit of quantification was 0.13 mg/m3 (the air volume was 1.5 L). Collection efficiency was 100%. Extraction efficiency was 99%. The relative standard deviation was 4.2%-6.3%. The penetration capacity was more than 264 microg. Sample could be stored for 14 days at least by ambient storage.

CONCLUSIONThis method is convenient, applicable and sensitive, suitable to determinate ammonia in air of workplace.

Air Pollutants, Occupational ; analysis ; Ammonia ; analysis ; Chromatography, Gas ; methods ; Specimen Handling ; Workplace

This study was conducted to investigate of water qualities in the upper and middle reaches of the Han River. For this purpose, water was sampled at Kwangjin and 1st Han-River Bridges of the Han River in Seoul and analysed from August, 1988 to September, 1989. The results are summarized as follows: 1. Water quality at 1st Han-River Bridge was more polluted than that at Kwangjin Bridge. 2. Except biological oxygen demand (BOD), turbidity, suspended solid (SS), dissolved oxygen (DO), DO saturation (DOS), ammonia nitrogen (NH3-N), nitrite nitrogen (NO2-N) and chloride ion (Cl-) at Kwangjin and 1st Han-River Bridges were lower as compared with the previous data before redevelopment of the Han River. 3. SS, DO and pH at Kwangjin and 1st Han-River Bridges could be classified to the 1st grade in environmental water quality standard. DOS at Kwangjin Bridge was over 100% and that at 1st Han-River Bridge was below 100% in the Han River. BOD at Kwangjin Bridge could be classified to 2nd grade and that at 1st Han-River Bridge to 3rd grade in environmental water quality standard. 4. The higher the level of water was, the lower the levels of turbidity and SS, and NH3-N was decreased with increasing water level at 1st Han-River Bridge. DO was decreased as water temperature went up but DOS was increased with DO. BOD was positively correlated with nitrite-nitrogens. 5. Turbidity and SS at the both sites and Chloride ion (Cl-) at Kwangjin Bridge were increased in July and August. And DO at the both sites and NH3-N at 1st Han-River Bridge were decreased in at July and August.
Ammonia ; Biological Oxygen Demand Analysis ; Hydrogen-Ion Concentration ; Nitrogen ; Oxygen ; Rivers ; Seasons* ; Seoul ; Water Quality ; Water*

The performance of internal-loop air-lift nitrifying bioreactor was good with strong tolerance to influent ammonia concentration (78.49 mmol/L), high volume converting rate (163.18 mmol/L.d) and obvious working stability (ammonia removal > 94.42%). During operation of internal-loop air-lift bioreactor, the nitrifying activated sludge was granulated. The nitrifying granular activated sludge began to appear on day 45. Its average diameter was 0.83 mm, settling velocity was 55.53 m/h and specific ammonia removal rate was 0.95 mmol (NH4(+)-N)/g (VS).d. The nitrifying granular activated sludge had the activity for anaerobic ammonia oxidation with ammonia oxidation rate of 0.23 mmol (NH4(+)-N)/g(VS).d and nitrite reduction rate of 0.24 mmol (NO2(-)-N)/g(VS).d.
Ammonia ; metabolism ; Anaerobiosis ; Bioreactors ; Nitrites ; metabolism ; Nitrogen ; metabolism ; Oxidation-Reduction ; Sewage ; analysis

OBJECTIVETo prepare a zinc porphyrinated polyimide nanofibrous membrane for rapid detection of trace amount of ammonia.

METHODSZinc porphyrin chromophore was copolymerized into polyimide backbones and the according nanofibrous membrane was prepared by electrospinning technique. Ammonia detection was achieved by recording the color and spectral changes of the membrane before and after exposing to the target gas. The sensitivity, selectivity and detection limit of prepared membrane were further studied.

RESULTSThe obtained nanofibrous membrane preserved typical photophysical properties of zinc porphyrin chromophores. When exposed to ammonia, a dual chromo and spectrum responses of the nanofibrous membrane were observed. The binding affinity constant and the detection limit of zinc porphyrinated polyimide nanofibrous membrane calculated from surface plasmon resonance (SPR) analysis and UV-vis were 3.33 X10³ L/mol and 3.13 mg/m³, respectively.

CONCLUSIONThe membrane prepared in this study exhibits good sensitivity, selectivity and reproducibility towards ammonia detection.

Ammonia ; analysis ; Imides ; Membranes, Artificial ; Metalloporphyrins ; Nanostructures ; Sensitivity and Specificity ; Surface Plasmon Resonance ; methods

OBJECTIVETo explore the process of refuse decomposition in hybrid bioreactor landfill.

METHODSThe bioreactor landfill was operated in sequencing of facultative-anaerobic and aerobic conditions with leachate recirculation, pH, COD, and ammonia in the leachate and pH, biodegradable organic matter (BDM), and cation exchange capacity (CEC) in refuse were detected.

RESULTSCEC increased gradually with the degradation of refuse, which was negatively correlated with BDM. COD and ammonia in the leachate was declined to 399.2 mg L(-1) and 20.6 mg N L(-1), respectively, during the 357-day operation. The respective concentrations of ammonia and COD were below the second and the third levels of current discharge standards in China.

CONCLUSIONThe refuse is relatively stable at the end of hybrid bioreactor landfill operation. Most of the readily biodegradable organic matter is mineralized in the initial phase of refuse degradation, whereas the hard-biodegradable organic matter is mainly humidified in the maturity phase of refuse degradation.

Ammonia ; analysis ; Biodegradation, Environmental ; Bioreactors ; Cations ; Hydrogen-Ion Concentration ; Methane ; analysis ; Organic Chemicals ; analysis ; Oxygen ; analysis ; Regression Analysis ; Time Factors ; Waste Disposal, Fluid ; Water Pollutants, Chemical ; isolation & purification

OBJECTIVETo study the effect of endophytic fungi.

METHODA. formosanus, harvested after having been cultured for age, statistics were taken, fresh weight and dry weight were gained, and enzyme activities of chitinase, beta-1,3-glucase, phenylalanine ammonia-lyase and polyphenoloxidase were determined.

RESULTThe survial rates of A. formosanus inoculated with endophytic fungi was 100%. The effect of fungi on fresh weight was very significant (P < 0.01). The effect of fungi on dry weight was significant (P > 0.05). The four enzyme activities were enhanced by endophytic fungi, comparision with the controls.

CONCLUSIONSurvial rates of A. formosanus can be increased by using endophytic fungi in vitro culture.

Catechol Oxidase ; analysis ; Chitinases ; analysis ; Mycorrhizae ; physiology ; Orchidaceae ; enzymology ; growth & development ; microbiology ; Phenylalanine Ammonia-Lyase ; analysis ; Plants, Medicinal ; enzymology ; growth & development ; microbiology ; Symbiosis ; beta-Glucans ; analysis

In order to simultaneously remove carbon and nitrogen from organic-rich wastewater, we used an up-flow anaerobic sludge bed/blanket (UASB) reactor that was started up with anammox with high concentration of carbon and nitrogen by gradually raising the organic loading of influent. We optimized the removal of nitrogen and carbon when the chemical oxygen demand (COD) concentration varied from 172 to 620 mg/L. During the entire experiment, the ammonium and total nitrogen removal efficiency was higher than 85%, while the average COD removal efficiency was 56.6%. The high concentration of organic matter did not restrain the activity of anammox bacteria. Based on polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) and tapping sequencing analyses, the Planctomycete, Proteobacteria, Chloroflexi, Chlorobi bacteria are detected in the UASB reactor, which indicated complex removal pathway of carbon and nitrogen coexisted in the reactor. However, a part of Planctomycete which referred to anammox bacteria could tolerate a high content of organic carbon, and it provided help for high performance of nitrogen removal in UASB reactor.
Ammonia ; chemistry ; Biological Oxygen Demand Analysis ; Bioreactors ; Carbon ; chemistry ; Nitrogen ; chemistry ; Sewage ; Waste Disposal, Fluid ; methods ; Waste Water ; chemistry