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Statistics in Analytical Chemistry: Part 15—Calibration Example 5

This real-world example of calibration diagnostics involves the ion-chromatographic behavior of phosphoric acid; phosphate is the actual analyte form that is measured by the instrument. read more
Statistics in Analytical Chemistry: Part 16—Calibration Example 5 (Concluded)

In the previous article (American Laboratory, Feb 2005), calibration data were diagnosed for a study involving phosphate. read more
Simple, Environmentally Friendly Mercury Analysis by U.S. EPA Method 1631

Mercury analysis, according to U.S. EPA Method 1631E, focuses on the monitoring of waste effluents at the lowest U.S. EPA Water Quality Certification (WQC) levels. read more
Statistics in Analytical Chemistry: Part 17—Calibration Example 6

This installment will present the sixth and last in this series of calibration examples. read more
Bridging the Gap Between Research and IT

At the heart of every scientific research and development effort is a significant amount of data. read more
Statistics in Analytical Chemistry: Part 18—Calibration Example 6 (Concluded)

In the previous article (American Laboratory Aug 2005), borate data were presented. No single model was found to be adequate. read more
Statistics in Analytical Chemistry: Part 19—Internal Standards

The previous several articles have dealt with calibrationstudy design and calibration-diagnostic procedures. read more
New Products at Pittcon® 2011

The following includes some of the latest advances in laboratory instrumentation debuting at Pittcon® 2011. read more
Statistics in Analytical Chemistry: Part 20—Recovery Curves

In Part 19 of this series (American Laboratory Dec 2005), the use of an internal standard (IS) was discussed and an example was given. read more
Optimal Baseline Correction for Multivariate Calibration Using Open-Source Software

Baseline estimation and correction is critical for many types of spectral data. read more
Statistics in Analytical Chemistry: Part 21—Recovery Curves and Internal Standards (Concluded)

The previous two installments have discussed the issue of nonideal recovery, a problem that occurs in many analytical methods. read more
Statistics in Analytical Chemistry: Part 22—Lack-of-Fit Details

Because of popular demand from readers, this installment will discuss the principles and calculations that underlie the lack-of-fit (LOF) test. read more
Getting the Most Out of Compressed Gases: The Role of the Gas Pressure Regulator

Suppliers of compressed gases go out of their way to deliver gas products that meet customer requirements for purity, mixture accuracy, and other specifications. read more
Positional Fluctuation of IR Absorption Peaks: Frequency Shift of a Single Band or Relative Intensity Changes of Overlapped Bands?

There are two schools of thought in interpreting the so-called positional fluctuation of peaks of IR spectra under the influence of environmental factors, i.e., temperature and concentration. read more
Increasing Protein Expression With Stackable Shakers

With the 2012 Olympics fast approaching, many still remember the trouble caused by one of the most notorious recombinant proteins, human growth hormone (HGH). read more