Evaluation of a visual color comparator method for determination of atmospheric nitrogen dioxide

1967 ◽  
Vol 1 (1) ◽  
pp. 75-76 ◽  
Author(s):  
Seymour. Hochheiser ◽  
G. A. Rodgers
Keyword(s):  
Nitrogen Dioxide ◽  
Atmospheric Nitrogen ◽  
Comparator Method ◽  
Visual Color ◽  
Color Comparator

scholarly journals A Micro-impinger Sampling Device for Determination of Atmospheric Nitrogen Dioxide

2019 ◽  
Vol 19 (11) ◽  
pp. 2597-2603
Author(s):  
Juliano Passaretti Filho ◽  
Maria Angélica Martins Costa ◽  
Arnaldo Alves Cardoso
Keyword(s):  
Nitrogen Dioxide ◽  
Atmospheric Nitrogen ◽  
Sampling Device

Erratum: Atmospheric nitrogen dioxide at ambient levels stimulates growth and development of horticultural plants

Botany ◽  
2008 ◽  
Vol 86 (4) ◽  
pp. 442-442 ◽  
Author(s):  
Suaad E.H. Adam ◽  
Jun Shigeto ◽  
Atsushi Sakamoto ◽  
Misa Takahashi ◽  
Hiromichi Morikawa
Keyword(s):  
Nitrogen Dioxide ◽  
Growth And Development ◽  
Atmospheric Nitrogen ◽  
Horticultural Plants ◽  
Ambient Levels

scholarly journals The study of patterns of influence of alkali treatment on properties of organosolvent cellulose from straw of rice

2018 ◽  
Author(s):  
А.В. Вураско ◽  
Е.И. Симонова ◽  
А.Р. Минакова ◽  
Д.Д. Манойлович
Keyword(s):  
Metal Ions ◽  
Rice Straw ◽  
Lignin Content ◽  
Alkali Treatment ◽  
Alkaline Treatment ◽  
Raw Material ◽  
High Yield ◽  
Color Determination ◽  
Visual Color

Получение доступных сорбентов на основе природных материалов, для визуального колористического определения содержания ионов металлов в загрязненных природных и сточных водах является актуальным направлением исследований. Сорбенты на основе технической целлюлозы удовлетворяют этим требованиям. В работе для получения технической целлюлозы предложено использовать биомассу соломы риса. Для удаления из соломы риса минерального компонента при проведении окислительно-органосольвентной варки используют стадию щелочной обработки, которая приводит к деструкции полисахаридов, снижая выход технической целлюлозы. В связи с этим целью работы является изучение закономерностей проведения щелочной обработки соломы риса для максимального сохранения высокого выхода технической целлюлозы, извлечения минеральной части и возможности применения данной целлюлозы в качестве колористического сорбента. С учетом предварительных исследований найдены оптимальные значения технологических факторов, обеспечивающих высокий выход волокнистого материала из соломы риса при минимальном содержании в нем минеральных компонентов. Последующая органосольвентная варка позволяет получить техническую целлюлозу с выходом – 48,8% от абсолютно сухого сырья (а.с.с), зольностью 0,05% от а.с.с., содержанием лигнина 2,5% от а.с.с., удовлетворительными прочностными характеристиками, высокими сорбционными свойствами, необходимой белизной и рН водной вытяжки. Выявлено, что техническая целлюлоза из соломы риса содержит металлы, накопленные биомассой за вегетативный период. Щелочная обработка и окислительно-органосольвентная делигнификация в большинстве случаев приводят к снижению концентрации металлов в технической целлюлозе. Исключение составляют алюминий, железо и свинец, содержание которых в технической целлюлозе увеличивается. Таким образом, целлюлоза, полученная в оптимальных условиях щелочной обработки и последующей окислительно-органосольвентной варки из соломы риса, с учетом содержащихся в ней металлов, пригодна для использования в качестве сорбента для визуального колористического определения содержания ионов металлов в загрязненных природных и сточных водах. Receive available sorbents based on natural materials for visual color determination of the content of metal ions in contaminated natural and waste waters is a topical area of research. Sorbents on the basis of technical cellulose satisfy these requirements. In the process of obtaining technical cellulose is proposed to use biomass straw rice. Removal of straw rice mineral component when carrying out the oxidation-organosolvent use the cooking stage alkali treatment, which leads to degradation of polysaccharides, reducing the output of technical cellulose. In this regard, the aim of this work is to study the regularities of the alkaline treatment of rice straw for maximum preservation of the high output technical cellulose, extracting the mineral and the possibility of using the cellulose as the colour of the sorbent. Taking into account the preliminary studies, optimal conditions of technological factors were found ensuring a high yield of fibrous material from rice straw with a minimum content of mineral components in it. Subsequent organosolvent pulping yields technical pulp with a yield of 48.8% bone dry raw material (BDRM), an mineral ash content of 0.05% of BDRM, a lignin content of 2.5% of BDRM, satisfactory strength properties, high sorption properties, the necessary whiteness and pH of aqueous extract. It is revealed that the technical cellulose from straw of rice contains metals accumulated biomass during the vegetation period. Alkaline treatment and oxidative-organosolvent the delignification in most cases leads to a decrease of metal concentrations in pulp technical. With the exception of aluminum, iron and lead, the content of which is technical cellulose increases. Thus, cellulose obtained in optimum conditions of alkaline treatment and subsequent oxidation-organosolvent pulping of straw of rice, taking into account the contained metals suitable for use as a sorbent for visual color determination of the content of metal ions in polluted natural and sewage waters.

scholarly journals Determining NO2 immission levels in a conflicted area: Riobamba, Ecuador

2019 ◽  
Vol 28 (3) ◽  
pp. 465-475
Author(s):  
Marcel Paredes ◽  
Dayana Auqui ◽  
David Idrovo ◽  
Rafaela Viteri
Keyword(s):  
Nitrogen Dioxide ◽  
Traffic Emissions ◽  
Passive Samplers ◽  
Vehicular Traffic ◽  
The Relationship

Riobamba has areas with high vehicular influence. For the determination of nitrogen dioxide concentrations, passive samplers were used, which were placed at points throughout the domain. The concentrations obtained in the field were interpolated with the information generated with the model traffic emissions software, estimating the relationship between vehicular traffic and the presence of gas. Allow to know the amount of pollutants that breathe about 250 pedestrians on average in the area.

scholarly journals Influence of nitrogen dioxide and acetylene on marbles, ceramics and pigment

2013 ◽  
Vol 10 (2) ◽  
pp. 183-191
Keyword(s):  
Air Pollution ◽  
Nitrogen Dioxide ◽  
Synergistic Effects ◽  
Scientific Basis ◽  
Solid Surfaces ◽  
Reversed Flow ◽  
The Social ◽  
Tio2 Pigment ◽  
Adsorption Quantity

The air pollution has a great impact on the social and economic aspects all over the world. Thus, the interaction of materials with the atmosphere has received increased attention nowadays. In order to estimate the impacts of air pollution on the solid surfaces a suitable scientific basis is developed and the well known Reversed Flow - Inverse Gas Chromatography, RF- IGC, is used. This dynamic experimental technique leads to very interesting experimental results through the determination of some important physicochemical quantities. The solids studied were Pentelic marble, white TiO2 pigment, ceramic and the gases were NO2 and C2H2. The synergistic effects between acetylene and nitrogen dioxide were also investigated. Through the curves obtained for each adsorption quantity determined versus time, one can easily and accurately conclude the result of the pollution impact on every solid mentioned above. The surface topography and the mechanism of deterioration can also be studied. All the above answer in detail to the questions of where, when and how the influence of gas pollutants on materials of cultural heritage takes place.

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