Overview
Total Dissolved Solids (TDS) represents the cumulative concentration of dissolved substances in water, including salts, minerals, metals, and organic compounds. Unlike suspended solids, TDS particles pass through a 2-micron filter. It is a critical metric in environmental monitoring, drinking water standards, and industrial processes where water purity affects product quality. TDS originates from natural sources (rock weathering, geothermal activity) and anthropogenic inputs (agricultural runoff, industrial discharges). Regulatory bodies like the WHO recommend a maximum TDS of 500–1,000 mg/L for potable water, though thresholds vary by region and application.
Physical and Chemical Properties
TDS itself is not a chemical compound but a collective measurement. Common constituents include calcium, magnesium, sodium, potassium, bicarbonates, chlorides, and sulfates. These ions contribute to conductivity, which is the basis for most TDS meters (1 μS/cm ≈ 0.64 mg/L TDS). Gravimetric analysis, the gold standard for TDS measurement, involves evaporating a filtered sample and weighing the residue. This method captures non-conductive organics but requires lab equipment. Field meters trade precision for convenience by estimating TDS from electrical conductivity and a user-defined conversion factor.
Main Applications
In agriculture, TDS monitoring prevents soil salinization from irrigation water. Hydroponic systems typically maintain 800–1,500 mg/L TDS for optimal nutrient delivery. Reverse osmosis plants use TDS meters to assess membrane efficiency, with rejection rates exceeding 95% for quality systems. Industrial applications include boiler feedwater treatment (high TDS causes scaling) and wastewater compliance monitoring. Beverage producers control TDS to ensure consistent taste, while pharmaceutical manufacturers require ultra-low TDS (<10 mg/L) for injection-grade water.
Safety and Storage
TDS measurement devices require regular calibration with standard solutions (e.g., 1,413 μS/cm KCl at 25°C). Electrode-based meters must be stored with protective caps to prevent dehydration. Samples for lab analysis should be collected in clean, non-reactive containers and tested within 24 hours to prevent biological activity from altering results. While TDS alone doesn’t indicate toxicity, elevated levels may signal harmful contaminants like nitrates or heavy metals. Industries must correlate TDS with compound-specific tests when regulatory compliance is required.
B2B Procurement Guide
For TDS meters, prioritize models with automatic temperature compensation (ATC) to correct for the 2% per °C conductivity variance. Industrial buyers should verify IP ratings for dust/water resistance and probe materials (e.g., titanium electrodes for corrosive environments). Service providers offering TDS testing should detail their methodology (SM 2540 C for gravimetric) and detection limits. Bulk discounts often apply for routine monitoring contracts. For high-purity water applications, consider systems combining TDS meters with inline pH and ORP sensors for comprehensive quality control.
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