The IV Line News from the Lab
Inorganic Ventures' E-newsletter  •  December 2004  •  ivstandards.com
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In this issue...
 News from the Lab  Articles Online
 Analytical Quick Tip  Joke of the Month
 Linearity Slope Variance

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News from the Lab
Standards Across the Globe

Standards Across the Globe
More Distribution Centers Worldwide
We've expanded our distribution capabilities to many new countries, including China, Germany, Italy, Japan, and dozens of other locations. See our complete list of distributors for details.

Marine Toys For Tots Foundation

Helping Children
Donations to Toys For Tots
Throughout December, Inorganic Ventures will be donating a percentage of every order to Marine Toys For Tots, a nonprofit foundation that provides for underprivileged children. We thank you for your support.

Analytical Quick Tip

When mixing or diluting standards, add roughly 50 % of your water and all of your acid to the container first, followed by mixing. Be sure this is done BEFORE adding your standard(s).

Linearity Slope Variance

Each analyst has to ask, "What is the purpose of the method and what variance is allowable?" As we focus upon the purpose of the method, we begin to define what deviation can be allowed, i.e., we begin to define boundaries based upon the purpose of the method. The method being validated should always consider the concept and fit the purpose. These criteria are then defined as part of the method validation process.

There is a commercially available program that you may want to add to your holiday shopping list. STATISTICA Base by StatSoft computes various statistics related to gauge linearity and accuracy. The output includes:

  1. The fitted regression line and R-squared for Bias vs. Master Value;

  2. The Mean Bias for each Master Value;

  3. A scatterplot of the Bias Values vs. the Master Values with the Bias Means and the regression line plotted;

  4. The Gage Linearity statistics -- Linearity and % Linearity;

  5. The Gage Accuracy statistics: Bias and % Bias;

  6. A bar chart of % Linearity and % Bias.

If you are interested in obtaining the software, visit StatSoft's website for specific product and pricing details.

Articles Online  more articles »

Accuracy, Precision, Mean and Standard Deviation
Part fourteen of our ICP Operations guide addresses accuracy, precision, mean, and deviation as related to chemical measurements in the field of analytical chemistry.

Significant Figures and Uncertainty
Part fifteen of our ICP Operations guide discusses significant figures and uncertainty pretaining to analytical chemical measurements.

Expressing Sensitivity
Dr. Gaines offers his expertise to help chemists properly express sensitivity when working with ICP.

Calculating Weighing Uncertainty
Dr. Gaines provides an effective way to determine uncertainty when weighing samples.

Joke of the Month  more humor »

Q: If H20 is water, what is H204?

A: Drinking, bathing, washing, swimming and cooking.
Element of the Month
Silver

Analytical Periodic Table

Storage & Handling:  Keep tightly sealed when not in use. Store and use at 20 ± 4°C. Do not pipet from container. Do not return portions removed for pipetting to container.

Chemical Compatibility:  Stable in HNO3 and HF. Avoid basic media. Ag forms more insoluble salts than any other metal. It also is subject to photochemical reduction to the metal in HCl media although 10 µg/mL solutions in 10% HCl [AgClx1-x] are commonly used in the analytical laboratory. The most common solubility problems exist with arsenate, arsenite, bromide, chloride, iodide, carbonate, chromate, cyanide, iodate, oxalate, oxide, sulfate, sulfide, tartrate, and thiocyanate in aqueous media. The addition of nitric acid renders many of these salts soluble.

Stability:  2-100 ppb levels stable for 75+ days when mixed with equivalent levels of all other elements including the precious metals (where chloride is present) when in 1% HNO3 / LDPE container. 1-10,000 ppm solutions chemically stable for years in 1-5% HNO3 / LDPE container.

Ag Containing Samples (Preparation & Solution):  Metal (soluble in HNO3); Oxides (soluble in HNO3); Ores (digestion with conc. HNO3).

Excerpt from Inorganic Venture's Analytical Periodic Table: Includes detailed analytical data for more than 70 elements.
 
Elemental Wordplay
Rearrange the elemental symbols to solve the riddle. Clues appear in quotes.

December's riddle...

What man was inspired by "bitterness", "greed" and...

    - Chromium
    - Germanium
    - Sulfur
    - and 2 parts Oxygen?

(answer at bottom of page)
**********************************************************************************************************
 Wordplay answer:  Postage (S,Cr,O,O,Ge)
 The IV Line · News from the Lab  · December 2004 (volume 12)
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