Food, Soil/Organic Material Analysis

Analysis of a soil, food, organic & Cosmetics sample to determine nutrient content, composition etc.

Organic foods are one of the fastest growing sectors of the food industry today.   Certified organic foods are tested for authenticity before they receive certification. A certification is a guarantee that the organic foods have been produced and processed without the use of pesticides and chemical fertilizers and they do not contain any contaminants.  Services of organic food testing laboratories are often used to analyze organic foods for their nutrition content and the accrued health benefits they might claim. Food testing assures consumers that the products they are purchasing, often at premium prices, are authentically organic.

Soil organic matter influences many of the physical, chemical and biological properties of soil. Some of the properties influenced by organic matter include soil structure, water holding capacity, nutrient contributions, biological activity, water and air infiltration rate and pesticide activity. Due to the importance of organic matter in the soil, the number of requests from GLP customers to test the organic matter level has increased markedly in the past 5 years.

wo common methods for analysis of soil organic matter are the Walkley-Black acid digestion method and the weight loss on ignition method. Welcos Laboratory offers both of these methods of soil organic matter analysis to GLP soil characterization customers. The Walkley-Black method, used since the 1930’s, uses chromic acid to measure the oxidizable organic carbon in a soil. Concern for the disposal of the chromium and the hazard of using this very strong acid by laboratory technicians, prompted the development of the Weight Loss on Ignition method in the early 1980’s. The Weight Loss on Ignition method is based upon measuring the weight loss from a dry soil sample when exposed to high temperatures (360oC). The weight loss that occurs at this temperature is then correlated to oxidizable organic carbon.