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As with any analytical test method - sample storage and storage conditions should be evaluated for stability. In particular to TOC samples, the FDA explicitly states on their website that "If TOC samples are being held for long periods of time before analysis, a firm should verify the impact of sample holding time on accuracy and limit of quantitation."
One can achieve this type of study by creating a sample stability test plan over a lengthy period of time to determine the variability in stability. A 12 week study is sufficient, where you are testing vials of a TOC standard at a specific concentration from time zero to time end. All vials should contain the same concentration, be stored in the same vial and the same temperature during the study. You would test the accuracy of this standard each week and determine at what point the sample stability is in question. Any result lower than 85% should be questioned.
What else can I help you with?
Is carbon black organic or inorganic?
No. the word organic means "to contain carbon" but carbon, carbon monoxide and carbon dioxide were discovered and understood well before the concept of "organic" came about. So we historically did not label them as organic and still do not. Also, that which we use the word "organic" for is usually long chains of organic molecules and CO2 and CO are small molecules. So they dont direclty apply.
How does carbon get inside fossil fuels?
Carbon gets inside fossil fuels through the decomposition of organic matter, such as plants and animals, over millions of years. As the organic matter gets buried deep in the Earth's crust, heat and pressure transform it into fossil fuels like coal, oil, and natural gas. These fuels consist primarily of carbon compounds formed from the original organic material.
How can you calculate organic matter content in soil?
The amount of oxidizable organic carbon and the degree of weight loss from sustained temperatures at 680 degrees Fahrenheit (360 degrees Celsius) are ways to calculate the organic matter content in soil. The first-mentioned measure is the Walkley-Black method that employs hazardous chromic acid in soils whose organic matter measures at less than two percent. The second-mentioned measure is the Weight Loss on Ignition method whose weight loss gets correlated with oxidizable organic carbon in soils whose organic matter measures at more than six percent.
How is activated carbon utilized in the treatment of wastewater?
Activated carbon is used in wastewater treatment to remove contaminants through a process called adsorption. The activated carbon has a large surface area that can attract and trap pollutants, such as organic compounds and heavy metals, from the water. This helps to purify the wastewater before it is discharged back into the environment.
What substance was used to treat the DNA before placing the samples into the wells?
To treat the DNA before placing the samples into the wells, a loading dye containing substances like glycerol and bromophenol blue is commonly used. The loading dye helps to visualize and track the DNA samples as they move through the gel during electrophoresis.
Is carbon black organic or inorganic?
No. the word organic means "to contain carbon" but carbon, carbon monoxide and carbon dioxide were discovered and understood well before the concept of "organic" came about. So we historically did not label them as organic and still do not. Also, that which we use the word "organic" for is usually long chains of organic molecules and CO2 and CO are small molecules. So they dont direclty apply.
Why do proteins considered organic molecules?
They are made from many carbon atoms.
How does carbon get inside fossil fuels?
Carbon gets inside fossil fuels through the decomposition of organic matter, such as plants and animals, over millions of years. As the organic matter gets buried deep in the Earth's crust, heat and pressure transform it into fossil fuels like coal, oil, and natural gas. These fuels consist primarily of carbon compounds formed from the original organic material.
How can you calculate organic matter content in soil?
The amount of oxidizable organic carbon and the degree of weight loss from sustained temperatures at 680 degrees Fahrenheit (360 degrees Celsius) are ways to calculate the organic matter content in soil. The first-mentioned measure is the Walkley-Black method that employs hazardous chromic acid in soils whose organic matter measures at less than two percent. The second-mentioned measure is the Weight Loss on Ignition method whose weight loss gets correlated with oxidizable organic carbon in soils whose organic matter measures at more than six percent.
What makes an organic energy or candy bar purely organic?
organic foods have no relation to the science of organic chemistry. organic foods have to be grown with certain guidlines to be labelled an organic produce though even this can vary from place to placebut speaking in a broader sense, organic substances are any molecule that has a carbon backbone this include a wide variety of substances ranging from gasoline to aspirin to the proteins and lipids that make we humansAnswerThe same thing that makes anything organic. Carbon. Every product that contains carbon is, by definition, organic. People like the previous respondent have tried to steal the word and change it's meaning. But look it up in any dictionary (hurry, before the hippies get them all changed), and you will find that what I say is true. Now, "purely organic" is another story. In order to be purely organic, a product can contain only carbon. The only products that qualify are graphite and diamonds. There's no such thing as "purely organic food", unless, of course, you like eating graphite and diamonds.
How do you get free food samples?
You can contact the manufacturer and ask if they have samples. I've done this before. There are also several web sites that catalog various free samples, for which you can apply.
What will happen if activated carbon mixed with water?
When activated carbon is mixed with water, the carbon will adsorb impurities and contaminants present in the water. This can help to remove pollutants such as chemicals, odors, and organic compounds, making the water cleaner and safer to drink. Be sure to properly filter out the carbon before consuming the water.
Do organic compounds have a higher boiling point?
Higher than what? Some organic compounds (e.g. propane, butane) have very very low boiling points making them gases at room temperature. Certain inorganic compounds (e.g. tungsten carbide) have boiling points so high that before those compounds boiled all organic compounds would not only have boiled but would have decomposed into their elements or very simple inorganic carbon compounds (e.g. carbon monoxide, carbon dioxide).
Where can you find good free pad and tampon samples?
Most companies no longer give free samples of tampons or pads.The only company I know who still does this is Cottons organic tampons and pads, they will send small sample packs containing a tampon, pad, and liner. You can buy softcup samples from their web site which isn't free but is a cheap way to try softcups before buying a full pack. Otherwise you may sometimes see free samples advertised on freebie sites but it's really uncommon these days.
Why is it necessary to grind the food samples before testing?
ur face
When do you not take a blood sample?
Samples must be take before milking
Before George Gallup which characteristic did polling samples often have?
biased
