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Questions tagged [environmental-chemistry]

For questions regarding chemicals and chemical processes that act on and interact within environmental systems.

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4
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1answer
1k views

What molecule is mostly responsible for the smell of petrol/gasoline when I refill my car?

Is it benzene or is there another aromatic molecule in gasoline with "heavier scents"? Does anybody know of a scientific investigation to provide evidence for an answer?
3
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1answer
2k views

How does pH level change the concentration of dissolved oxygen (DO) in sea water?

I am planning to investigate the relationship between $\mathrm{pH}$ and dissolved oxygen. I would like to have a reason without taking in account the plants, animals and decomposer roles. I want to ...
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0answers
140 views

How can I get rid of 700 million tons of chlorine gas?

I am conducting a thought experiment in which 40 million tons of hydrogen are supplied through saltwater electrolysis each year, creating 700 million tons of chlorine gas (Cl2) and 800 million tons of ...
3
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1answer
158 views

Is there any reason to fear personal exposure to rain with a pH of 3.1?

Where I live now there can be significantly acidic rain. The government posts measurements for many cities and there can be stretches for days or longer with reported pH of 3.2 or 3.1. I even saw 2.9 ...
3
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1answer
433 views

Exhaust gas purification

I'm more asking this because I'm not sure how far science has come. Pretty much, I've been thinking about the car exhaust system lately. The two main components that lead to hazards from cars are $\ce{...
2
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1answer
231 views

Is organic carbon the same thing as organic compounds?

Are they the same thing or is there some minute difference? I have looked all over the web and you would think this would be a common question but I can't find any answer. If they are different then ...
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2answers
153 views

Why NOx will break the ozone sphere

I've found that a reason for people to oppose supersonic aeroplanes was the $\ce{NO_{$x$}}$ gases it released would do harm to the ozone layer. So what is the mechanism of this?
7
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2answers
8k views

Is there an easy way to test for the amount of iron (Fe) in water?

I have a rusty metal rainwater tank, and I'd like to find the amount of iron in the water. (The water I've collected is perfectly clear.) How would chemists in the 1800's have gone about this? What ...
4
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3answers
2k views

pH of rain with and without thunderstorm

I just came to know that pH of rain water will be lesser when it is accompanied by a thunderstorm than when it is not accompanied by thunderstorm. Why would it be so? Will the temperature increase due ...
4
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1answer
254 views

Comparing Methods of Determination of Dissolved Oxygen Content in Water Sample

I am currently doing an IB Chemistry Individual Investigation on dissolved oxygen in water samples by using Winkler method. However, my teacher suggested that I have to use oxygen probe as a standard ...
4
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1answer
184 views

Is there a chemical treatment for pipes to reduce or eliminate leaching of lead into tap water?

Given events in Flint, Michigan, where a switch to acidic river water in the city water supply resulted in leaching of lead into tap water from the insides of pipes, I wonder -- has anyone has heard ...
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1answer
112 views

Finding out the composition of seawater/brine?

As part of a project, I am working on precipitating salts from seawater and brine. I have a sample of seawater and I need to measure the concentrations of $\ce{Mg^2+, Ca^2+ and Li+}$ present in the ...
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1answer
90 views

Why perborate is greener bleaching agent?

All I know is, perborate degrades into supposedly less harmful compounds. But what exactly happens that it is considered greener? Consider say perborate vs. hypochlorite. Why perborate is "greener"?
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2answers
12k views

Why does ozone, being heavier than air, not settle down?

Is this because of some equilibrium between diffusion and gravity ? What exactly is responsible?
4
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1answer
152 views

Particle size of oxides of nitrogen and sulfur pollutants and HEPA filters

I am thinking about buying air purifier as pollution is high in my city. Going through the specifications of HEPA filters, I found that they block particulate matter of 2.5. PM 2.5 contains dust and ...
0
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1answer
183 views

Heavy Metal Toxicity [closed]

Ok, so I am working on a project where I have to make a tax for manufacturers using non recyclable materials. So for this tax you multiply the weight (in kg) by how toxic the material is, this gives ...
5
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1answer
4k views

How much worse is methane than CO2 as greenhouse gas? [duplicate]

I can't find a coherent answer to this question. The numbers are all over the place. 25 times greater 84 times more potent The reason I'm looking is because I can't find a reason in physics why this ...
6
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2answers
1k views

Why does water condense on grass and iron grills in cold weather?

In my book it is said that in cold weather fog appears. This fog is nothing but water droplets. After a hot day if the night is cold then the moister in air starts to condense. What I do not ...
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0answers
217 views

What are most common condition for reduction of hematite to magnetite?

I found that hydrogen can reduce $\ce{Fe2O3}$ to $\ce{Fe3O4}$ under anaerobic conditions, but since I dont have $\ce{H2}$ in my lab what should I use to convert hematite into magnetite? and what ...
2
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0answers
271 views

Difference between starch surfactant and CTAB, SDS, Tx-100

I am doing a research on the effect of surfactant on ZnO nanoparticles properties. There is a confusion here between starch surfactant and CTAB, Tx-100 and SDS. I need point on what is the difference ...
0
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1answer
61 views

Chemical consideration of biodegradeability

We hear the term 'biodegradeability' being thrown around alot in science, but rarely ever is the science itself explained. What are the chemical properties in a substance that make it biodegradeable?...
6
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2answers
1k views

What causes methane to have 25 times higher global warming potential than CO2

What causes methane to have 25 times higher global warming potential than $\ce{CO2}$? I think it has to do with $\ce{CH4}$ being a less massive molecule, but I'm not sure.
3
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1answer
91 views

Biodegradation time for biodegradable shopping bags?

How long does it take for the plastic/polythene shopping bags marked biodegradable to biodegrade?
11
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1answer
707 views

Urban air pollution and the smell of freshly cut lawn grass?

Recently, all the lawns in the apartment complex that I live in have had their lawns cut - giving that pleasant smell of freshly cut lawn. Now, I am aware that the smell arises from a chemical ...
3
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0answers
63 views

Atmospheric carbon removal: asphalt from CO2?

In reading a text about $\ce{CO2}$ recycling and sequestration of various kinds, I came to think about storing atmospheric $\ce{CO2}$ as asphalt. Given cheap energy as in the case of Iceland, and ...
6
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1answer
147 views

Bromate forming in open water

According to this article, the city of Los Angeles (in the USA) is facing a problem where bromate, a suspected carcinogen, has been forming in their open water supplies. They believe that the ...
33
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4answers
6k views

How much CO2 could you remove from the atmosphere with 2 trillion USD?

I know it's possible to capture $\ce{CO2}$ with various chemical reactions. For example NASA's space shuttle had some kind of regenerative $\ce{CO2}$ scrubber. But how expensive is it? Could a huge ...
6
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0answers
497 views

Is my understanding of the Frasch Process correct?

So basically, the whole point of this process is to extract elemental sulfur from underground deposits. Is this process essentially correct or am I missing out certain details? Firstly, three ...
2
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1answer
730 views

to convert ppm gas (N2O) concentrations in microgram nitrogen per gram dry soil basis?

What calculations are needed to convert $\ce{N2O}$ gas concentrations in ppm to micrograms of nitrogen per gram dry soil basis? I measured the concentration of $\ce{N2O}$ in soil samples. I extracted ...
7
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1answer
208 views

Amending soil pH to change the color of hydrangea flowers

I would like to ensure that my hydrangeas are blue. I am told that adding ammonium sulfate or aluminium sulfate will cause the soil to be more acidic. I am also told that adding elemental sulfur will ...
11
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2answers
3k views

What makes pentane, hexane, heptane, and octane dangerous, while butane and nonane aren't?

In particular, how do a methylene more (in the case of the pentane) and a methylene less (in the case of the octane) make the difference in harmfulness to the environment in comparison with, ...
4
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1answer
129 views

Measurement of Water Clarity

Turbidity is essentially the clarity of water. Turbidity can be measured in many ways such as a turbidimeter, secci disk or a turbidity tube (which incorporates a secci disk at the bottom). If you had ...
5
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1answer
45 views

Can weathering change the composition of something so that it appears different?

There's a murder trial ongoing in Ireland at the moment and one of the pieces of evidence is a spade found at the scene along with the skeletal remains. It was contended by the prosecution that this ...
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1answer
58 views

Eco Friendly Cleaning Solution [closed]

I would like to find a solution that can kill roof algae, fungus, mold, mildew effectively without using environmentally unfriendly products but don't know enough about chemistry to make a solution ...
1
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1answer
1k views

TPE fabric vs PVC fabrics?

I am currently in charge of purchacing fabrics from asia. My personal policy is to try and stay as enviromentally freindly as possible. Your answer to the following question would be of great help and ...
2
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0answers
401 views

What is the carbon footprint of a diamond? [closed]

I think it would be interesting and illuminating to calculate the carbon footprint (per carat) of diamond. The answer would undoubtedly be different for artificial (industrial grade) diamonds vs. ...
3
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1answer
2k views

Using sodium peroxide to scrub carbon dioxide emissions

I am a student from a school and recently I came across the reaction $\ce{2Na2O2 + 2CO2 -> 2Na2CO3 + O2}$ Can't we use this reaction to reduce $\ce{CO2}$ in the atmosphere by placing some $\ce{...
3
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1answer
805 views

Efforts made to reduce the amount of CFC

Till now I have heard $\ce{CO2}$ is the main reason of global warming. I have studied the remedies to control $\ce{CO2}$ many times through books, awarness programs, etc. But today I learned about ...
2
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1answer
57 views

What would chemistry seniors like to hear about industrial hygiene?

I have a master degree in physical chemistry with close to 10 years experience as a chromatographer in pharma. About two years ago I made a career change into industrial hygiene. Right now I am ...
2
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2answers
437 views

Formation of 2,4-Dichlorophenol by free chlorine mediated oxidation of Triclosan

I cannot find much guidance in the literature. This is the reaction between free chlorine in water and triclosan. I understand ether cleavage and electrophilic aromatic substitution (maybe) involved. ...
4
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1answer
241 views

What element or compound could be used to make the ocean more basic?

The ocean is becoming acidic. This is not a natural evolutionary change but happens through human negative effect on the environment. What element or compound could be used to create a more base ocean?...
5
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1answer
170 views

Disposing of hazardous waste indicated by numbers on chemicals

I'm doing a book for the African market and the syllabus asks for discussions on proper disposal of chemicals and waste products, particularly in the classroom setting The authors said something ...
5
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1answer
274 views

Environmental Alkylating Agents

I am looking for the names of some environmental alkylating agents (in context of DNA damages) found for example in the fume produced by industry. Most of the papers which I have found is concentrated ...
3
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2answers
7k views

What are possible hazards of fog machines?

From a chemistry point of view I would like to learn about possible hazards of fog machines. Such devices, also called “foggers”, create vapor which appears like fog or smoke. It is used in discos, ...
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1answer
170 views

Global warming kinetics

A rule of thumb in chemistry is that a reaction doubles in rate for every 10 °C increase in temperature. Considering the impact of a 10 °C increase in global temperature, would the same rule apply to ...
2
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2answers
113 views

How to determine source of air pollution

It should be determined by some metal markers (meaning originating from traffic etc.) but I cannot find any source which would describe it. Thanks.
2
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1answer
72 views

How is Humic substance destroyed in nature?

Humic substance consists of many, to my knowledge poorly understood, species of organic matter, mostly carbohydrates chained in intersting (and also poorly understood) ways. Humic substance is an ...
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1answer
223 views

The science behind fertilizers

Do you know some books or articles that elaborate on the chemistry behind fertilizers? I have taken organic chemistry so far, and inorganic chemistry as well. I am also familiar with the Haber-Bosch ...
8
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2answers
296 views

How is this mystery chemical reducing carbon emissions?

My chemistry is not good enough to solve this problem, and it's driving me crazy. At my job, a sales agent approached me to be their representative in my area for their product. It's a product that ...
7
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2answers
2k views

What chemicals could absorb/adsorb ambient atmospheric methane?

From an article in the New Scientist in 2010, Since pre-industrial times, methane levels in the atmosphere have risen from around 715 parts per billion to nearly 1800 ppb, claims Folberth. "If ...

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