Questions tagged [toxicity]

Questions on the harmful effects of various substances on the human body, or biological organisms in general.

28 questions with no upvoted or accepted answers
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Why are S-thiocarbamates less toxic than carbamates?

According to Haley and Rhodes, neostigmine bromide (alternatively known as Prostigmine) has an LD50 in mice of around 0.165 mg/kg by IV injection. Pubchem claims that this is also the LD50 for ...
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138 views

Toxicity of vanadium in pottery

I mix and develop glaze recipes for midfire stoneware (fired to 1220°C). The colorants in pottery are mostly iron, copper, cobalt, tin, titanium, chrome, and a few other transition metals. Many of ...
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57 views

Choosing electrodes for corrosive environments

Background I'm building a watering robot for my household plants. For the purpose of measuring the moisture content of the plant I intend to use a resisitive approach where I pass an electric current ...
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115 views

Could the inks used in Wonder Bread container have caused lead poisoning?

Decades ago I recall reading that the colorful wrapper of Wonder Bread was misprinted inside out and therefore the printed logo rubbed off on the bread itself, bread was used and kids ended up with ...
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131 views

Why is dimethylmercury more toxic (to animal life) than methylmercury or ethylmercury?

It's obviously a two step process to reduce dimethylmercury to the less harmful inorganic form. Is neuronal uptake also enhanced due to lipophilicity? Is there some other mechanism of toxicity I'm ...
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377 views

What are the dangers of melting HDPE and silicone? Is it even possible?

I've searched the internet and couldn't find a specific answer. There doesn't seem to be a single recycling company that takes empty silicone tubes (also know as mastic tubes) and recycles them. As a ...
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1k views

Cat litter crystals causing toxic smell upon rubbing and pouring out of the package, safe?

I am under-educated in terms of chemistry hence the question and assumptions. Basically, for our cats, we are using what seems to be the latest scientific achievement in litter sand - the litter ...
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269 views

Cubic zirconia additives and toxicity

What are cubic zirconia (CZ) gemstones usually colored with? According to wikipedia the following dopants are being used: Cerium Chromium Neodymium Erbium Titanium. Chromium is quite colorful ...
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84 views

Is turpentine (as a solvent in plant-based paints) toxic after application? How long?

Turpentine is often used as a solvent in plant-based paints. It is believed that turpentine is equally if not more toxic than white spirit (see Green Building Handbook. Volume 1 by Tom Woolley,Sam ...
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102 views

Colour change on exposure to singlet oxygen?

Is there a dye that is particularly well suited to radical colour change on interaction with singlet oxygen, preferably non-toxic? Based on this answer: https://chemistry.stackexchange.com/a/27633/...
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268 views

Activated carbon filter vs. Reverse osmosis filter

I have a 5 month old baby and I'm currently using an activated carbon water filter with the city tapwater supply (I live in Mumbai, India and the water can be highly polluted sometimes with all sorts ...
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909 views

How to test for presence of Tobacco/nicotine in a product?

I found this paper that says nicotine was found in major toothpaste brands in India. Rather than playing blame game, wouldn't it be easier to test ourselves ? How to test for presence of Tobacco/...
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Chemical safety information: Where to look to find out how poisonous poisons are?

Could someone point me toward a primer on how to read the toxicity warnings on standard chemical data sheets? Or alternatively, where one should look for more precise information than is contained on ...
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How do structural differences between neostigmine and TL-599 contribute to differences in toxicity?

Stevens and Beutel studied the activity of several carbamate anticholinesterases. Among other things, they found that the (4-trimethylammonio)phenyl dimethylcarbamate iodide (The para-analog of ...
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35 views

Why are carbamates capable of inhibiting acetylcholinesterase?

Certain carbamate compounds, such as the insecticide carbaryl or the Edgewood carbamates such as EA-3990, can inhibit the enzyme acetylcholinesterase. Unlike organophosphorus compounds, however, they ...
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49 views

Do any pharmaceuticals increase in potency or toxicity over time?

Pursuing a question raised in these comments: Are there any known pharmaceuticals that increase in potency or toxicity during storage, or over periods of months to years? If not, what if we broaden ...
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358 views

What makes dimethylmercury ((CH3)2Hg) so penetrative through latex and human skin?

I've read the story of Karen Wetterhahn and how she was poisoned and died from two drops of dimethylmercury that accidentally fell on her latex glove, and I was wondering what is the chemical ...
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181 views

How do we know a nerve agent is tasteless?

According to the BBC, the nerve agent sarin is a tasteless liquid. How do we know that this liquid has no taste, given that anyone to have (not) tasted it in any meaningful quantity presumably died ...
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What sort of lab can determine PAH concentration in a soil or charcoal sample? How difficult is it to do?

Non-chemist here. I'm curious how difficult it is to determine concentration of PAH in a sample of soil or powdered charcoal, or a sample of the two mixed together. What would be involved in doing ...
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Avoiding chemical reactions with carbonated alcoholic drinks

I'm making a cooling beverage dispenser for carbonated drinks. The keg remains room temperature and the beverage rises through a pipe that's coiled up inside a cooling unit filled with water or ...
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21 views

How do I understand exactly how hazardous a material is based on SDS?

I work with a lab occasionally and get asked often if a chemical is safe to breathe, how hazardous is it if it lands on skin, etc. For the most part, I'll try to go to an SDS and look it up. The ...
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33 views

A dataset of drugs or molecules that failed the FDA approval process

I am looking for a dataset of bad drugs, the opposite of FDA approved drugs. There is this database of withdrawn drugs, but these drugs were withdrawn after making it into the market. Is there any ...
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36 views

Risks of using organic mercury compounds in analytical chemistry

I'm interested in speciation analysis. Hearing of fatal accidents with organic mercury compounds made me wonder about the risks for the analytical chemist trying to determine Hg species in foodstuff. ...
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34 views

Hexanoic acid and copper/brass - toxicity?

We have a sensor made of brass through which we are flowing organic solvent vapours mixed with air, typically hexane and various alcohols. After a year or so the interior is covered in a greenish-...
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134 views

Which one is the healthiest to operate a lantern with: kerosene, diesel or sunflower oil?

Given a lantern (originally made for kerosene) however, I'm looking for the fuel which is the safest for indoor use. I've already tried different kinds, and found three of them that burn just as ...
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793 views

At what scenario will a LCD monitor that used mercury inside their lamp be harmful

Small amount of mercury and/or mercury vapors is harmful to human as it can cause damage to vital organs such as brain, heart and so on. However, there are many electronic devices such as LCD monitor ...
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1k views

Perfluorobutanesulfonic acid (PFBS) Safety and Toxicity

I was wondering if anyone had any experience with PFBS or PFOS (perflurooctane sulfonic acid)? I am thinking about trying to purchase some of these fluorosurfactants in bulk in order to (hopefully) ...
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112 views

Is it OK to dispose of potassium hydrogen phthalate into the sewer system?

I have been using potassium hydrogen phthalate (KHP) for creating primary standards. I have looked into the Flinn catalog, and the disposal consideration is classified as "organic acids, must be ...