Name: Colorimetric Tube with Stopper
Brand: RichTech

Specifications

Colorimetric Tube · Specifications

The following are standard volume ranges, supplied in matched sets of 12. Custom volume ranges or special graduations are available upon request.

Request custom specs

Volume Range (mL)	Tubes per Set	Approx. Diameter (mm)	Approx. Height (mm)	Material	Sealing Type
5 – 10	12	13 – 16	100 – 120	Borosilicate 3.3	Ground Glass Stopper
10 – 25	12	16 – 20	120 – 160	Borosilicate 3.3	Ground Glass Stopper
25 – 50	12	20 – 26	160 – 200	Borosilicate 3.3	Ground Glass Stopper
50 – 100	12	26 – 32	200 – 250	Borosilicate 3.3	Ground Glass Stopper

* Diameter and height dimensions are approximate values. Actual dimensions may vary slightly.
* Custom volume ranges and special graduation markings available upon request. Bulk pricing available.

Matched Set Consistency: Each set of 12 tubes is carefully selected to ensure consistent diameter, height, and graduation positioning across the set. Premium matched sets with tighter tolerances are available for specialized applications.

Product Description

Colorimetric tubes with stoppers are essential matched-set apparatus for water quality analysis and photometric chemical determinations. Manufactured from high-quality borosilicate glass 3.3, each tube features precise graduations and a precision-ground glass stopper for secure sealing. Supplied in matched sets of 12, they ensure minimal inter-tube variability for accurate colorimetric comparisons.

Key Features

Borosilicate Glass 3.3: ISO 3585 compliant · Thermal shock resistance up to 280°C · Excellent chemical resistance to acids, alkalis, and organic solvents
Matched Set of 12: Uniform tube diameter and height across each set ensures minimal colorimetric error
Superior Light Transmission: High-purity glass delivers exceptional clarity for precise spectrophotometric measurements
Ground Glass Stopper: Precision-ground for a secure seal · Prevents sample evaporation and external contamination
Accurate Graduations: Permanent, clear markings at key volume points · Verified for accuracy
Chemically Resistant: Compatible with acids, alkalis, salt solutions, and common organic solvents

Quality Assurance

Each tube undergoes rigorous dimensional inspection, light transmission testing, and seal integrity verification. Matched sets are carefully selected to ensure tube-to-tube consistency within strict tolerances, providing reliable, reproducible data for your colorimetric analyses.

Note: Colorimetric tubes are designed as matched sets — always use the complete set of 12 for best results. Inspect tubes for scratches or residues before use, as these may affect light transmission and analytical accuracy. Regular calibration against standard solutions is recommended to maintain set consistency.

Applications

Typical Applications

Environmental Monitoring

COD, ammonia nitrogen, total phosphorus, total nitrogen, heavy metals in surface water, groundwater, wastewater, and industrial effluent

Water Quality Analysis

Routine monitoring and comparative testing at water treatment plants, utilities, and testing laboratories

Pharmaceutical & Chemical

Drug development, intermediate testing, and purity analysis via photometric methods

Research & Education

University and institutional teaching labs in environmental science, chemistry, and biology

Food & Agriculture

Food additive testing, pesticide residue analysis, soil nutrient determination

Standard Method Compatibility

HJ 535-2009 — Water quality · Determination of ammonia nitrogen · Nessler's reagent spectrophotometric method

GB 11893-89 — Water quality · Determination of total phosphorus · Ammonium molybdate spectrophotometric method

HJ 636-2012 — Water quality · Determination of total nitrogen · Alkaline potassium persulfate digestion UV spectrophotometric method

USEPA 350.1 — Ammonia nitrogen (Colorimetric, Automated Phenate)

APHA 4500-P — Phosphorus (Ascorbic acid method)

Compatible with all major spectrophotometric and visual colorimetric methods

Tip: Colorimetric tubes are designed to work seamlessly with volumetric flasks, pipettes, and burettes — part of RichTech's complete quantitative analysis system. For best results, pair with our full Volumetric series for consistent analytical precision.

Operation & Maintenance

Operation Guide

Preparation Before Use

Inspect each tube for cracks, chips, or scratches — damaged tubes must be replaced immediately
Ensure tube walls are clean and transparent — free from fingerprints, grease, or residues
Rinse tubes 2–3 times with distilled water before use
Verify stoppers fit snugly without wobbling or binding

Sample Preparation & Colorimetric Procedure

Transfer sample and standard series solutions quantitatively into the tubes
Add colorimetric reagent, then secure stopper and invert to mix (avoid vigorous shaking which may introduce bubbles)
Allow reaction to proceed according to the method specification
Wipe tube exteriors clean — ensure no droplets or smudges that could affect light transmission
In spectrophotometer, zero with blank, then measure standards and samples sequentially
Construct standard curve and calculate sample concentrations

Cleaning & Maintenance

Clean immediately after use to prevent dried residues from adhering to glass surfaces
Routine cleaning: Use mild detergent and a soft brush — rinse 3 times with distilled water
Stubborn residues: Soak in dilute nitric acid or specialized cleaning solution for 2–4 hours
Air dry inverted on a clean rack, then store in a dust-free cabinet
For extended storage, place a small piece of lint-free paper between the stopper and tube to prevent sticking
Always use matched tubes as a complete set — if a single tube requires replacement, recalibrate the entire set

Care & Notes

Show care & notes

Safety Precautions

When handling strong acids, alkalis, or toxic samples, wear appropriate PPE (gloves + goggles)
If reactions produce toxic or hazardous gases, perform all steps in a fume hood

Do not

Do not use cracked or damaged tubes — they may break during handling
Never place colorimetric tubes directly on hot plates or open flames
Do not interchange stoppers between tubes — each stopper is ground to match its specific tube