200 Ml Measuring Cylinder
Capacity(ml):5/10/25/50/100/250/500/1000/2000/5000
2.Stoppered measuring cylinder
Capacity(ml):5/10/25/50/100/250/500/1000/2000
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Description
Technical Parameters
A 200 ml measuring cylinder is a common laboratory tool designed for accurately measuring and dispensing liquid volumes. Typically made of durable, transparent materials like borosilicate glass or high-quality plastic, it features a calibrated scale etched or printed along its length, allowing precise volume readings up to 200 milliliters. The cylindrical shape minimizes meniscus distortion, ensuring reliable measurements.
Key features include a spout for clean pouring, a hexagonal or reinforced base for stability, and raised graduations to enhance readability. Its capacity strikes a balance between portability and practicality, making it suitable for various applications, including educational experiments, chemical preparations, and quality control processes. The 200 ml size is particularly useful when working with moderate liquid quantities, avoiding the bulk of larger cylinders while offering more capacity than smaller alternatives.
To ensure accuracy, users must read the measurement at eye level, aligning the liquid's meniscus (curved surface) with the closest graduation mark. Regular cleaning and proper storage (e.g., avoiding extreme temperatures) prolong its lifespan. Though less precise than volumetric flasks or pipettes, this cylinder balances affordability, ease of use, and sufficient accuracy for routine tasks, remaining a staple in chemistry, biology, and industrial labs worldwide.
Specifications
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applications
Environmental and Analytical Testing
The 200 mL measuring cylinder is indeed widely utilized in laboratory settings for measuring samples related to pH, conductivity, or pollutant concentration testing, owing to its practicality and accuracy in handling moderate liquid volumes.
PH Testing
In environmental or water quality analysis, it is used to accurately measure and transfer water samples for pH determination. This ensures consistent sample volumes, which is crucial for reliable pH readings, especially when using electrodes that require specific sample sizes for calibration and measurement.
Electrode Requirements:
- Calibration Standards: pH electrodes are calibrated using buffer solutions of known pH values (e.g., pH 4, 7, 10). These buffers must be measured precisely (e.g., 100–200 mL) to ensure accurate calibration curves. Inconsistent volumes can skew calibration, leading to erroneous pH readings.
- Sample Volume Sensitivity: Some electrodes (e.g., combination pH electrodes) require a minimum sample depth (typically 1–2 cm) to ensure proper immersion and minimize junction potential errors. A 200 mL cylinder ensures sufficient volume for reliable electrode submersion.
Reproducibility:
- Standardizing sample volumes across multiple tests (e.g., monitoring water quality over time) eliminates variability caused by inconsistent volumes, ensuring data comparability.
Surface Water Testing:
- Used to measure and transfer samples from rivers, lakes, or reservoirs for pH analysis, helping assess acidity/alkalinity impacts on aquatic ecosystems.
Wastewater Monitoring:
- Ensures compliance with regulatory pH limits (e.g., 6.5–9.0 for discharge) by accurately measuring treated or untreated wastewater samples.
Groundwater and Soil Leachate Analysis:
- Critical for detecting contamination from acid mine drainage, agricultural runoff, or industrial spills.
Drinking Water Quality Control:
- Verifies that pH levels (typically 6.5–8.5) meet safety standards to prevent corrosion of distribution pipes or health risks.
Moderate Volume Handling:
- Larger than 100 mL cylinders (for bulkier samples) but more precise than 500 mL+ containers (where pouring accuracy may decline).
Accuracy vs. Practicality:
- Class B tolerance (±1–2%) is acceptable for most pH measurements, balancing cost-effectiveness with sufficient precision.
Material Compatibility:
- Borosilicate Glass: Resists thermal shock and chemical corrosion, ideal for most aqueous samples.
- Plastic (PP/PFA): Shatterproof and suitable for fieldwork or when handling aggressive chemicals (e.g., acidic/basic solutions).
Sample Collection:
- Collect water samples in clean, pre-rinsed containers (e.g., HDPE bottles) to avoid contamination.
Volume Measurement:
- Pour the sample into the 200 mL cylinder, ensuring the meniscus aligns with the graduation mark at eye level to minimize parallax error.
Electrode Calibration:
- Use the cylinder to measure buffer solutions for calibration (e.g., 200 mL of pH 7 buffer for zero-point adjustment).
pH Measurement:
- Submerge the electrode in the measured sample (ensuring full immersion) and record the pH reading after stabilization.
Rinsing and Storage:
- Rinse the cylinder and electrode with deionized water between samples to prevent cross-contamination.
Temperature Compensation:
- pH is temperature-dependent. Use a thermometer to record sample temperature and adjust the pH meter's readings accordingly (or use ATC-equipped electrodes).
Avoiding Air Bubbles:
- Gently tap the cylinder to dislodge bubbles that could distort the meniscus reading or affect electrode response.
Electrode Maintenance:
- Store electrodes in proper storage solution (e.g., 3M KCl) to prevent dehydration and ensure longevity.
Sample Agitation:
- For heterogeneous samples (e.g., sediment-laden water), stir gently in the cylinder before measurement to homogenize the pH.
6. Real-World Example: pH Monitoring in Aquaculture
Scenario: A fish farm needs to maintain optimal pH (6.5–8.5) for trout survival.
Process:
- Collect water samples from different ponds using clean containers.
- Measure 200 mL of each sample in a cylinder.
- Calibrate the pH meter with 200 mL buffers (pH 7 and 10).
- Measure pH and adjust liming/acidification treatments if needed.
Outcome: Consistent pH readings ensure healthy fish populations and regulatory compliance.
The 200 mL measuring cylinder is indispensable in environmental and water quality analysis for pH determination due to its accuracy, versatility, and cost-effectiveness. By standardizing sample volumes, it enables reliable electrode calibration and measurement, critical for detecting pollution, ensuring regulatory compliance, and protecting ecosystems. When combined with proper technique (e.g., meniscus reading, temperature control), it becomes a cornerstone of precise pH analysis in laboratories and fieldwork.
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Conductivity Measurement
For assessing the electrical conductivity of solutions, which indicates ionic concentration, the 200 mL cylinder allows precise volume preparation. This is essential for standardizing solutions or diluting samples to appropriate concentrations for conductivity meters, ensuring accurate and comparable results.
Pollutant Concentration Analysis
In environmental monitoring, the cylinder is employed to measure and mix samples for pollutant analysis, such as heavy metals, nutrients, or organic contaminants. Accurate volume measurement is vital for diluting samples to within the detection limits of analytical instruments like spectrometers or chromatographs.
Design Features
A 200 ml measuring cylinder is a laboratory glassware essential for precise volume measurements, designed with specific features to enhance accuracy, durability, and user convenience. The cylinder features a calibrated scale (typically in milliliters) etched or printed along its length. For a 200 ml model, the scale often includes subdivisions (e.g., 1 ml or 2 ml intervals) to enable precise readings. The accuracy usually adheres to Class B tolerances (±0.6 ml at full capacity), balancing precision with practicality. Its slender, cylindrical shape minimizes the meniscus effect (curvature of the liquid surface), reducing parallax errors during readings. The height-to-width ratio also allows clear visualization of volume changes, even for small additions. A spout at the rim facilitates controlled pouring, minimizing spillage. The hexagonal or round base provides stability, preventing tipping on lab benches. Some models incorporate a reinforced rim to resist chipping. Most cylinders are made of borosilicate glass (e.g., Pyrex), which withstands thermal shock and chemical corrosion. Alternative materials like polymethylpentene (PMP) or polypropylene (PP) offer shatterproof options for student use, though with slightly lower temperature resistance. The scale includes permanent, acid-resistant markings (e.g., ceramic enamel) for longevity. Compliance with ISO/DIN standards ensures consistency in graduation intervals and overall dimensions. Some designs incorporate a raised ring or contrast stripe near the scale to highlight the meniscus, aiding accurate readings, especially in low-light conditions. The lightweight construction and textured grip area (if plastic) improve handling, while the transparent body allows simultaneous observation of liquid color and volume.
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