固体吸収剤を用いる煙道排ガス中のSO₂の分析方法を開発した。本法はアルカリ土類金属過酸化物によりSO₂を酸化吸収し, 吸収剤中に生じたSO₄^--根を抽出後, クロラニル酸バリウム法で定量するものである。各濃度のSO₂ガスを本法と自動測定器により分析した結果本法により50～1200ppmのSO₂ガスの分析が可能であることがわかった。本法は固体吸収法であるから, サンプリング装置は簡便で, 運搬, 保存に便利であるばかりでなく, 液体吸収法と異なり, ガス補集時のミスト発生はなく, したがって流量変化がなく, 圧損失をひき起こすこともない。

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A badge-type sampler for measurement of personal exposures to nitrogen dioxide in ambient air was developed. An absorbent filter containing triethanolamine solution absorbed nitrogen dioxide which diffused through layers of hydrophobic fiber filters. The wind effect on absorption rate was suppressed by the layers of these filters. It could determine the level of nitrogen dioxide of several ten ppb by exposure of several hours. The accuracy was within 20%. It was small (5×4×1 cm³), light (15g) and simple in structure. It could be applied without disturbing the motion of the subject person.

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The developed sampler is examined for measuring out suspended dust to the north, east, south and west winds in measuring period. This sampler is constituted of the four usual samplers, a wind-vane and switch auto-changer replying to the each wind direction. And it is able to separately catch suspended dust on the each filter for the different wind blowing by the developed sampler.
The suspended dust concentrations were five times measure using the developed sampler and the usual sampler at Toyohara Cho in Hiratsuka City for about fourty days from August to September in 1979. And Iron, Lead, Manganese, Vanadium, Titanium, Chromium and Nickel in the caught suspended dust were determined by the Fluorescent X-Ray Spectrometry method.
The concentrations of suspended dust and each metallic element measured by the developed sampler were compared with the value obtained by the usual sampler showed good agreement. When the wind blew from the east or north at the sampling site, the concentrations of air pollutants were shown the maximum affecting the industrial and urban area. On the other hand, the low level concentrations were shown in blowing southerly or westerly from the seaside and the rural country.
Within the results of this study, it was able to suppose the source of suspended dust and each metallic element by the developed sampler and this sampler was very useful.

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NO₂ sorption rate of plants was investigated using sunflower, maize, cucumber, tomato, castor-oil plant and morning glory (Exp. 1). Plants were fumigated with 0.8-1.2 ppm NO₂ for 5 hours in an artificially-lit growth cabinet. A linear relationship between NO₂ sorption rate and transpiration rate per unit water saturation deficit, regardless of plant species tested, was observed.
Effects of long-term fumigation with 0.2 ppm NO₂ on the sorption rate of NO₂ were also examined (Exp. 2). Sunflower, tomato and cucumber were grown for 1-2 months in naturally-lit growth cabinets with NO₂ and without NO₂. Immediately after the long-term NO₂ fumigation, NO₂ sorption rate and transpiration rate were measured under the fumigation with 1 ppm NO₂ for 4 hours in an artificially-lit growth cabinet. Both rates were similar in the long-term treated plants and in control plants. In tomato plants, long-term fumigation caused decrease in leaf area per plant 69% of control. In both experiments 1 and 2, NO₂ concentration in stomatal cavity of leaf surface was estimated to be 0 ppm, even though plants were hurted as tomato plants of experiment 2.

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Easy method of NO₂ measurement used triethanolamine filter paper has been studied by many workers.
In this work, the reliability and accuracy in this method, and many applications were examinea.
1) The scatters of the measured NO₂ concentrations of 10 samples at each station were expressed as nearly normal form distribution, and these in the standard deviation were in about ±20% of average value.
2) The relationship between the sample number N and sampling deviation σ/X was expressed as Log (σ/X) =-0.93 Log N+0.447.
3) The relationship between the capsule NO₂ concentration (μg/5ml) and the daily mean concentration (ppm) of Saltzmann NO₂ meter was expressed by NO₂ (ppm) =0.0125×NO₂ (μg/5ml) +0.0051 with ±20% error of ppm concentration.
4) The relationship between the measured NO₂ concentrations of upward-capsule and the downward-capsule could be cleared the field-influence of NO₂^- mist, particulate contained NO₂^-, etc.

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今回新たに測定した値も含め1962～1978年の間に米国および東京において観測された大気中のC₂～C₅炭化水素につき成分相互の関係を求めた。その結果, 互いに関連が深いと思われる2群の化合物集団が認められた。そのうちの1つ, 未燃焼のガソリンや液化石油ガス (LPG) に由来すると思われるブタン類とペンタン類で構成される集団における成分相互の比率の平面的, 時間的変動を調べた。イソブタン/n-ブタンおよびn-ブタン/イソペンタンの値では東京が合衆国におけるいずれの地域よりも高く, 東京では, ペンタン類をほとんど含まない上にn-ブタンよりイソブタンの含有率が高いLPGを使用しているタクシーの影響が大きいことを推定させた。またイソペンタン/n-ペンタンの値では両地域の差は大きくはないが, 合衆国では1973年以降20%程度増加した。また, エチレン, アセチレン, プロピレンから構成される相関の高い化合物群も認められた。これらの化合物は, 燃焼に伴い生成されたと考えられ, これらの比率はエンジンや走行状態あるいは車種などの差違により大きく変動すると予想されるが, 大気中で良好な相関と比較的安定した成分比率が保たれていることから, それら個々の発生源における差が全体としては相殺されていると推定された。ただ, 大気中のエチレンやプロピレンのアセチレンに対する比率は, 排ガス中のそれらよりも低く, 光化学反応等による減衰を示唆していた。

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Distribution of benzo (a) pyrene (BaP) in soil in urban area was investigated with a simple micro-analytical method consisting of ultrasonic extraction, one-dimensional dual band thin-layer chromatography (TLC) and spectrofluorometric determination. The TLC was done in the following condition; Thin-layer plate; Kieselguhr G (4×20 cm)-(26% Acetylated cellulose+Cellulose Avicel SF) (95: 5, w/w, 11×20cm), Developer; Methanol-ether-water (4: 4: 1 v/v).
The results thus obtained were as follows:
1) All samples collected from v arious areas were contained BaP.
2) BaP contents in soils obtained from industrial areas were much higher than those in soils from commercial and residential areas. The contents were 170-6030 ppb in industrial area, 90-4190 ppb in commercial area and 10-1150 ppb in residential area.
3) BaP contents in soils from principal roads were far higher than those from side roads and parks even when side roads and parks located near a principal road. These findings suggest strongly that soils in urban area are polluted by BaP emitted by automobiles.

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Nitrogen oxides in flue gases has been determined by the method of JIS K 0104. But this method occupies much time for determination.
Author improved on the former conventional sample solution adjustment method, and made an experiment on the new methods, annexing oxygen, hydrogen peroxide and sodium hydroxide solution to sample gas.
The results obtained were as follows:
1) Annexing oxygen, hydrogen peroxide and sodium hydroxide solution hastens absorption of nitrogen oxides to absorption solution.
2) In the case that annexed from 30 to 50 ml oxygen and from 0.1 to 3% hydrogen peroxide (solution pH above 10.5) to 150 ml sample gas, and shaken, absorption of nitrogen oxides is achieved within 10 minutes.
3) The results of this method were in good agreement with using JIS K 0104 to boiler or municipal solid waste incinerator exhaust gases.

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