CSC Scientific Blog

A blog about test equipment

The Simple Truth About Karl Fischer Moisture

Posted by Art Gatenby on Jul 9, 2020 3:05:35 PM

 

Read More

Topics: Coulometric Karl Fischer, Moisture Analysis, Moisture Testing, Karl Fischer Oven, Karl Fischer, Karl Fischer Titration, Loss-On-Drying, Moisture, interfacial tension, moisture content, moisture measurement

Loss-on Drying and Other Moisture Mysteries - Part V: Drying

Posted by Art Gatenby on Jun 17, 2020 12:18:01 PM

What seems like a million words ago, I began this journey explaining the simplest approach to measuring or determining moisture: Loss-on Drying. Little did I know how involved and esoteric it would become.

This voyage has taken me down mysterious paths through spooky theories, back to age-old chemistry concepts and into the vagaries of thermodynamics related to evaporation, vapor pressure, bound water and water activity. I have come full-circle; back to explaining Loss-on Drying -- a form of drying that I had assumed would be the simplest of all.

I thought the first four topics [evaporation, vapor pressure, bound moisture, water activity] were tough, complex, confounding and less-than-obvious. Drying -- defined as “the mass-transfer process of removing water (or other solute) by evaporation from a solid, semi solid or liquid” -- seemed easy.

As is often the case, reality makes “easy” a non-operative word. Such has turned out to be so with respect to the issue of drying.

Read More

Topics: Free Moisture, Moisture Sorption Isotherm, Moisture Oven Test, Moisture Analysis, Moisture Testing, Loss-On-Drying, Moisture

Loss-On-Drying Moisture Analysis and Other Moisture Mysteries Part IV: Water Activity

Posted by Art Gatenby on Jun 16, 2020 5:54:01 PM

Loss-On-Drying moisture analysis seemed like a simple process until, in a state of naïve bliss, I promised to look at evaporation, vapor pressure and bound water. While I was otherwise occupied with these realities, I offered to enter the world of witchcraft and folklore; water activity.

Read More

Topics: Bound Moisture, Moisture Sorption Isotherm, Moisture Analysis, Water Activity, Loss-On-Drying

Loss-On-Drying Moisture Analysis and Other Moisture Mysteries Part III: Free and Bound Water

Posted by Art Gatenby on Jun 16, 2020 2:35:12 PM

In my previous missive about Loss-On drying, we discussed Vapor Pressure -- because logically it was next. As we continue to explore moisture, we learn how vital vapor pressure is when regarding the quirky issues of free and bound water.

Read More

Topics: Evaporation, Bound Moisture, Free Moisture, Moisture Analysis, Moisture Testing, Karl Fischer Titration, Praxis Moisture Balance, Loss-On-Drying, Moisture, karl fischer moisture, water content measurement

Loss On Drying Moisture Analysis and Other Moisture Mysteries II Vapor Pressure

Posted by Art Gatenby on Apr 30, 2020 3:31:57 PM

A while ago on these pages I agonized about loss-on-drying moisture analysis . As you may recall, my explorations of the drying process overwhelmed me with evaporation concepts , vapor pressure notions, water content complexities and water activity witchcraft, all just to dry something.
Read More

Topics: Evaporation, Moisture Analysis, Moisture Testing, Loss-On-Drying

Loss-On-Drying Moisture Analysis and Other Moisture Mysteries Part 1

Posted by Art Gatenby on Apr 21, 2020 3:52:00 PM

One quiet night, I was musing over moisture analysis and how easy it is to do using loss-on drying. Little did I know what was in store.

Read More

Topics: Evaporation, Moisture Analysis, Moisture Testing, Loss-On-Drying, Moisture, moisture balance, moisture content

Instrument Accuracy?  Is it only an illusion?

Posted by Art Gatenby on Aug 28, 2019 12:05:00 PM

Regularly I’m asked the question; “How accurate is this moisture balance?”

The questioner asks for the answer in terms of percent (%) moisture. When I answer “it depends”, I always get the unspoken response, “Why did I ask this stupid idiot?

Absolute Measurement

When you ask about the accuracy of something like weight or temperature the answers are straight forward and relate to the instruments' precision. For example 25 grams or 50 degrees plus or minus (+/-) 0.1 gram or 1/2 degree.  

Percent is Relative

When you ask the question of how accurate is my percentage reading, the answer becomes complicated. It’s complicated because percentage (%) is a relative term. For example, the answer for the result of a Loss on Drying (LOD) moisture test, is based on the size of the sample you use.

Using the example of a LOD moisture test we can understand the concept. The result of this type of test is calculated by subtracting the weight of the sample at the end of the test from the weight of the sample at the beginning of the test. This difference is divided by the initial weight of the sample. This procedure produces a % moisture result.

Sample Size

In the following analysis, the implication s of sample size and instrument precision will be illustrated. This will be based on a sample that has 23.5% moisture and an electronic LOD moisture balance that has a sensitivity of 0.001 grams and repeatability of ± .005 grams.

Sample Analysis

Read More

Topics: Moisture Analysis, Moisture Testing, CSC Digital Moisture Balance, Loss-On-Drying, Moisture, moisture balance, instrument accuracy

Four Reasons Why Food Manufacturers Should Monitor Moisture

Posted by Amanda Ranowsky on Mar 12, 2018 8:00:00 AM

Moisture content is a critical factor to consider in the food industry. The amount of water in a product affects the product’s texture, shelf life, ease of processing, and cost to produce. Snack foods, baked goods, pet food, and dried goods are just a few examples of products that are vulnerable to moisture content issues like these. In many cases, an easy loss-on drying (LOD) test will allow you to monitor the moisture content of these products. (See the 3 Easy Steps to Run a LOD Test here.
 
Simple moisture analysis can be all it takes to improve the quality of your product. Let’s take a closer look at how moisture content affects each of these four product and production aspects.
Read More

Topics: Moisture Oven Test, Moisture Analysis, Moisture Testing, CSC Digital Moisture Balance, Loss-On-Drying, Moisture, fast moisture test, moisture balance, moisture content, moisture measurement

What Does A Moisture Balance Cost?

Posted by Art Gatenby on Mar 13, 2017 3:28:57 PM

Loss on Drying (LOD) Moisture Balance analysis is based on drying a sample and comparing the difference in weight before and after drying. 

Read More

Topics: Moisture Testing, Loss-On-Drying, moisture balance

LOD is Really Simple, or Moisture Analysis for the Newbie

Posted by Art Gatenby on Jun 12, 2015 4:51:00 PM

One quiet night, long ago I was musing over moisture analysis and how easy it is to do using Loss-on Drying (LOD). Little did I know what was in store.

Read More

Topics: Bound Moisture, Moisture Analysis, Moisture Testing, Loss-On-Drying

Subscribe via E-mail

Search the Blog

Most Popular Posts

Posts by Topic