Education Demonstration Phosphate Test Strips

SKU: 33817-P

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Use Indigo® phosphate test strips for clear, safe classroom demos of the phosphorus cycle, water pollution, and eutrophication. Ideal for chemistry or biology labs.

Phosphate testing provides a clear, hands-on way for students to explore the phosphorus cycle and its role in natural and human-influenced systems. Indigo® Phosphate Test Strips allow learners to visualize nutrient movement and accumulation through simple colorimetric changes, helping connect chemical measurements to real-world concepts such as eutrophication, algal blooms, and oxygen depletion. The straightforward dip-and-read format makes these strips well suited for classroom and teaching laboratory use.

We've been selling phosphate test strips since 2009. Buy fully documented Indigo® phosphate test strips, 50 strips/vial. Guaranteed 3 year shelf life (dated back from expiration date "yyyy.mm.dd").
Details Specs Docs Reviews
Details
Discipline Learning Outcomes / Key Features
Chemistry
  • Relate phosphate ions (PO43−) to solubility, pH, and ionic equilibria.
  • Observe real-world applications of colorimetric analysis without reagents.
  • Understand concentration units (ppm) and calibration of simple test methods.
Biology
  • Describe the role of phosphate in plant growth, ATP, and cell metabolism.
  • Demonstrate the effects of nutrient excess on algae and aquatic ecosystems.
  • Connect laboratory data to biological consequences such as eutrophication.
Environmental Science
  • Explain how agricultural runoff contributes to water pollution.
  • Compare phosphate levels in natural vs. treated or simulated waters.
  • Develop environmental stewardship through monitoring and remediation discussions.

Best Practices

  • Use dechlorinated water in experiments — chlorine can interfere with color development.
  • Keep phosphate stock solutions below 10 ppm for safety and realistic environmental modelling.
  • Include control samples (0 ppm) to help students recognize the color range accurately.
  • Store test strips in a cool, dry place and avoid touching the reactive pad.
  • Encourage quantitative discussion: What does 2 ppm mean in ecological terms?
  • Cross-test with nitrate or ammonia strips for a full nutrient cycle demonstration.
Related information or images
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Specifications

This Indigo® test strip indicates the presence of phosphate. Results for ranges shown below can be read in 30 seconds.

  • Phosphate is measured in increments of 10, 25, 50 & 100ppm
  • Phosphate strips have a detection limit of 5 ppm.
  • The number of strips (50) vial is approximate.
  • These strips have a guaranteed shelf of 3 years from date of manufacture (indicated by expiration date).
  • Reseal the desiccant lined bottle immediately after removing a strip to ensure 3 year shelf life.
  • Vial must be kept tightly sealed & kept at typical room temperatures.
Documentation

A Certificate of Conformance is available on request after shipment.
Indigo® phosphate test strips are made in USA & calibrated with NIST standards.

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Phosphate Test strips 0-100ppm Stability Statement Indigo Phosphate Test strips 0-100ppm CoA Indigo Phosphate Test strips 0-100ppm SDS
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