The Vernier Potassium Ion-Selective Electrode represents a significant advancement in the measurement of potassium ion (K+) concentrations in aqueous solutions. This portable sensor eliminates the complexities of traditional methods while delivering unprecedented accuracy and convenience.
Product Overview
Designed specifically for measuring potassium ion concentrations, this electrode pairs with the Vernier LabQuest 2 data collector to enable field measurements in various aquatic environments, from lakes to rivers. Its probe-style design, similar to conductivity or pH sensors, ensures ease of use in both laboratory and field settings.
Key Features and Benefits
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Portable operation:
Conduct measurements anywhere without laboratory constraints
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User-friendly design:
Simple plug-and-play functionality with minimal setup
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Precision measurement:
Rigorous calibration protocols ensure reliable results
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Broad applicability:
Suitable for environmental monitoring, agricultural research, and aquaculture
Technical Specifications
Measurement range:
1 to 39,000 mg/L (ppm)
Reproducibility:
±11% full scale (10-1000 mg/L calibration range)
Interfering ions:
Cs+, NH4+, H+, Ag+, Li+, Na+
pH range:
2-12 (without pH compensation)
Temperature range:
0-40°C (without temperature compensation)
Electrode slope:
+56 ±4 mV/decade at 25°C
Electrode resistance:
1-10 MΩ
Technical Details
Core Advantages
The electrode's primary strengths lie in its measurement precision and operational simplicity. Through careful calibration and optimization, it minimizes measurement errors while maintaining a user-friendly interface that requires minimal technical expertise.
Measurement Principle
Utilizing ion-selective membrane technology, the device incorporates specialized membrane material with high potassium ion selectivity. When immersed in solution, potassium ions selectively permeate the membrane, generating a measurable potential difference proportional to ion concentration.
Calibration Requirements
Regular calibration using standard solutions of known concentration is essential for maintaining accuracy. Detailed calibration protocols are provided, with options for manual calibration or automated calibration through the Vernier LabQuest 2 system.
Potential Interferences
While demonstrating high selectivity, measurements may be affected by certain ions (Cs+, NH4+, H+, Ag+, Li+, Na+) that compete with potassium ions. Environmental factors including pH and temperature also influence results, with optimal operation between pH 2-12 and 0-40°C.
Applications
The electrode serves multiple scientific and industrial purposes:
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Environmental monitoring:
Assessing potassium levels in natural water systems
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Agricultural research:
Evaluating soil potassium content for fertility management
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Aquaculture:
Maintaining optimal potassium concentrations in aquatic habitats
Additional applications extend to food and pharmaceutical industries for product quality control.
Operation and Maintenance
When used with the Vernier LabQuest 2 data collector, the system provides real-time data visualization and analysis capabilities. Proper maintenance including regular cleaning and solution replacement extends the electrode's operational lifespan.
Usage Considerations
Users should avoid mechanical shock or chemical exposure to the electrode, operate within specified environmental parameters, and follow all manufacturer guidelines for optimal performance.
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