This study measured organic matter content in soils with chloride (Cl-) and developed a table to reduce Cl- interference by adding sulfuric acid (H2SO4) beforehand. The key findings are: Cl- interference can be reduced by 18.0% when organic matter is ≤0.2%; by 8.0% when organic matter is 0.2-0.6%; by 6.0% when organic matter is 0.6-1.0%; by 26.0% when organic matter is 1.0-1.3%; by 14.0% when organic matter is 1.3-1.6%; by 8.0% when organic matter is 1.6-1.9%; by 4.0% when organic matter is 1.9-2.3%; by 1.6% when organic matter is 2.3-2.8%; by 1.2% when organic matter is 2.8-3.2%; by 0.6% when organic matter is 3.2-3.6%; by 0.4% when organic matter is 3.6-3.8%; by 50.0% when organic matter is 4.0%; by 42.0% when organic matter is 4.0-4.49%; and by 32.0% when organic matter is above 4.49%.