EC (Soluble Salts) and pH
EC: This test is performed on the as-received sample on a 1:5 (dw/v) basis. First determine the moisture content. Then weigh into a 250 mL flask the equivalent wet weight to give 40 g of dry weight material (e.g. if the moisture is 50%, weigh out 80 g fresh to get 40 g dry material). Add water to bring final volume to 200 mL. This will give a dilution ratio of 1:5. Shake on shaker for 20 minutes. Determine the electrical conductance of the 1:5 slurry with a conductivity meter. Read and record the conductivity of the slurry in mmhos/cm to 2 decimal places.
pH: Scoop 15 mL fresh compost. Bring volume to 30 mL with deionized water. Stir and let sit for 30 minutes. Analyze pH on Analyzer.