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All Right Reserved
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HS Code |
744330 |
| Productname | Xylenol Orange Tetrasodium Salt |
| Casnumber | 3618-43-7 |
| Molecularformula | C31H24N2Na4O13S |
| Molecularweight | 792.55 g/mol |
| Appearance | Red to violet powder |
| Solubility | Soluble in water |
| Meltingpoint | Decomposes |
| Storagetemperature | 2-8°C |
| Absorptionmax | 433 nm (aqueous solution) |
| Phrange | Indicator range: 5.4 to 7.2 |
| Grade | Indicator grade |
| Synonyms | 3,3'-Bis[N,N-di(carboxymethyl)-aminomethyl]-o-cresolsulfonphthalein tetrasodium salt |
| Application | Complexometric indicator for metal titrations |
As an accredited Xylenol Orange Tetrasodium Salt factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | The chemical is packaged in a 25g sealed amber glass bottle, labeled "Xylenol Orange Tetrasodium Salt," featuring hazard and safety information. |
| Shipping | Xylenol Orange Tetrasodium Salt is shipped in tightly sealed, chemical-resistant containers to prevent moisture and contamination. The packaging complies with safety and regulatory standards for laboratory chemicals. During transit, it is protected from excessive heat, light, and physical damage. Appropriate labeling ensures proper identification and safe handling upon delivery. |
| Storage | Xylenol Orange Tetrasodium Salt should be stored in a tightly closed container, protected from light and moisture. Keep it in a cool, dry, and well-ventilated area, ideally at room temperature (15–25°C). Avoid sources of heat and incompatible materials such as strong oxidizing agents. Proper storage ensures chemical stability and prevents degradation or contamination. |
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Purity 98%: Xylenol Orange Tetrasodium Salt with 98% purity is used in complexometric titrations of metal ions, where it ensures accurate end-point detection. Molecular Weight 760.498 g/mol: Xylenol Orange Tetrasodium Salt of molecular weight 760.498 g/mol is used in preparation of calibration standards for spectrophotometry, where it guarantees precise quantification of metal concentrations. High aqueous solubility: Xylenol Orange Tetrasodium Salt with high aqueous solubility is used in aqueous analytical assays, where it provides rapid reagent dissolution and uniform reaction kinetics. Stability temperature up to 40°C: Xylenol Orange Tetrasodium Salt stable up to 40°C is used in field-based metal ion determination kits, where it maintains analytical reliability under variable ambient conditions. Particle size <50 microns: Xylenol Orange Tetrasodium Salt with particle size less than 50 microns is used in automated liquid handling systems, where it enables homogeneous dispersion and consistent reagent delivery. UV-visible absorbance λmax 433 nm: Xylenol Orange Tetrasodium Salt with UV-visible absorbance maximum at 433 nm is used in colorimetric detection methods, where it provides distinct absorbance signals for quantitative analysis. pH stability range 1–10: Xylenol Orange Tetrasodium Salt stable across pH 1–10 is used in multi-environment industrial water testing, where it assures reliable chelation and endpoint visibility in diverse media. Low impurity level <0.5%: Xylenol Orange Tetrasodium Salt with impurity level below 0.5% is used in high-sensitivity environmental monitoring assays, where it minimizes background interference and enhances assay accuracy. |
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In a world where accuracy matters, Xylenol Orange Tetrasodium Salt offers something both simple and invaluable: reliable metal detection by color. Laboratories often face a maze of choices for analytical reagents, and I‘ve seen promising-sounding alternatives create more confusion than clarity when precision is on the line. Anyone who has watched faint pinks blur indistinctly across a spectrophotometer knows the frustration of ambiguous readings. Over the years, chemists and technicians lean on tools that reduce interpretation errors. Xylenol Orange stands out because it consistently gives a sharp color response, where some agents muddy under similar conditions.
Every batch of Xylenol Orange Tetrasodium Salt comes as a bright orange-red powder. You can easily dissolve it in water, and almost nothing about its handling disrupts a sane workflow. The tetrasodium salt variant is preferred for its crisp solubility in aqueous solution and a minimal tendency to form troublesome precipitates, especially compared with the free acid form. If you have ever prepped a metal ion assay only to find flakes at the bottom of your flask, you realize the relief from such quirks.
At a technical level, its molecular structure (C31H28N2Na4O13S) allows for strong chelation with a variety of metal ions, including iron, calcium, and zinc, among others. In practice, this means the product binds selectively, offering a tell-tale color change that can be tracked both visually and spectrometrically. With wavelengths typically falling around 430 nm for the metal-complex, most basic UV-Vis setups can handle it without fuss. And unlike some dyes that drift in color or fade during use, Xylenol Orange maintains its tone through multiple standard stock solutions—this feature matters, especially when daily calibrations eat up precious work hours.
The biggest challenge in choosing a colorimetric agent is the question of interference and background noise. In my experience working with both calmagite and eriochrome black T, a persistent drawback comes from their partial reaction with non-target ions or their diminished performance in acidic environments. Xylenol Orange, particularly in its tetrasodium salt form, resists these distractions. Its transition point covers a useful pH range, allowing measurements with less tweaking of sample conditions. For those who test natural waters or biological fluids—samples notorious for unpredictable composition—the reduction of background interference can save entire projects.
EDTA titrations, a mainstay for water hardness testing, benefit from Xylenol Orange’s clear endpoint cues. Instead of squinting and swirling, waiting for a purple tinge to “maybe” appear, you watch for an unmistakable orange-to-yellow switch. In low-concentration scenarios, such as trace metal analysis, this direct feedback lowers the risk of overshooting titrations. Other indicators might lag or give ambiguous colors, leading to costly repeats or questionable data.
I recall a class in which a mixture of reagents left half the students with blue complexes, the rest with something closer to brick red. Confusion reigned. A mentor introduced Xylenol Orange as a demonstration in consistency, and suddenly, entire rows of flasks pulsed with practically the same hue. It was a lesson in simplicity: for all the theoretical choices available, the best solution usually finds its place in real repeatable outcomes.
In the years since, I’ve leaned on this reagent for more than textbook experiments. When environmental labs push through hundreds of samples screening for trace metals, consistent performance cuts down troubleshooting. Hospitals and clinical labs, forever watching for anomalous measurements, trust that their colorimetric kits won’t require constant recalibration. Even in teaching, the confidence of a clear color change helps students spend their energy on technique instead of second-guessing results.
Stability plays a large role in daily operations. Some dyes succumb to photodegradation or chemical oxidation after only a few weeks on the shelf, forcing rushed preparations before every run. Xylenol Orange stands up well to routine storage, especially as the tetrasodium salt, which resists clumping and preserves its quality under regular lab humidity. This might sound trivial, but a day saved on troubleshooting is a day spent progressing an actual project.
The versatility of Xylenol Orange becomes clear as projects evolve. Research labs value that it handles a range of sample matrices—tap water, river samples, serum, or even unknown industrial solutions. Whether pipetting micro-liters in a high-throughput analyzer or mixing up fresh standards by hand, technicians can expect the same color response. In my own experience, an entire multi-institution research group trusted it to keep their inter-laboratory calibrations on track. The shared reliance on a dependable indicator helps keep data comparable, no matter the measuring site.
Stacking Xylenol Orange against other popular indicators, the strengths stand out. Compared to calmagite, which sometimes gives a slow or incomplete color transition, Xylenol Orange responds more immediately to endpoint shifts. Unlike eriochrome black T, it stays reliably dissolved, which avoids the creeping issue of dye particles sticking to glassware and skewing results over time. Many other complexometric indicators either lack clarity in strongly acidic or basic conditions or suffer from a narrow selectivity window, so their practicality drops whenever the lab deals with borderline samples.
Most alternatives cater to a specific metal or require careful adjustment to avoid overlap with unintended ions. Xylenol Orange can handle several relevant targets in a single workflow without special modifications. The absence of strong sulfide or nitrate interference broadens its applicability for routine monitoring of groundwater, process streams, or biological fluids. In the hands of seasoned analysts, this versatility means faster adaptation to novel or changing projects, avoiding the long lead times and troubleshooting associated with switching indicators.
Ease of use rarely gets top billing in technical write-ups, but it shows up day after day in actual work. Xylenol Orange Tetrasodium Salt dissolves fast in deionized water, creating stock solutions free from floaters or stubborn granules. This straightforward prep process frees up both novice and veteran staff from guesswork and endless vortexing. During analysis, color changes show up clearly even in modestly lit labs, so endpoints don’t vanish in shadows or strong sunlight—in my own hands, a distinct visual endpoint avoids the tedium and ambiguity that slower-reacting dyes create.
Labels and instructions across multiple suppliers point to the same basic features, but long-term users will confirm that batch consistency means fewer “bad days” for both routine screening and high-stakes environmental compliance work. Kits and classroom sets using Xylenol Orange stretch out over the semester without worry about premature degradation. Public health labs tracking weekly fluctuations in lead or iron find peace of mind in a reagent that keeps pace with high sample numbers.
Take environmental monitoring, for example. Water quality labs look for simple tools that require little maintenance and withstand busy schedules. Xylenol Orange’s color change signals calcium, magnesium, and heavy metal presence in rivers or drinking water sources, helping regulatory agencies respond quickly to contamination threats. In medical labs, the same strength finds use screening for abnormal metal levels in blood, urine, or even tissue extracts. People’s health depends on trustworthy analysis, and the last thing anyone wants is inconsistent results because of an underperforming indicator.
Industry—especially sectors like electroplating, textiles, and chemical manufacturing—deal with strict specifications for trace metals in products or waste streams. A reagent that provides direct, visual confirmation of compliance saves money and keeps operations running smoothly. I’ve seen manufacturing teams breathe easier once the lab adopts an indicator that works regardless of raw material fluctuations or seasonal process changes. The cost of a repeat test, or regulatory penalties for exceeded limits, far outweighs the basic chemical purchase.
Peer-reviewed literature and reference method compendia, including the American Public Health Association (APHA) Standard Methods for the Examination of Water and Wastewater, continue to recommend Xylenol Orange for critical titrations and spectrophotometric assays. The consistency of published data highlights the method’s low susceptibility to common interferences. Clinical diagnostics handbooks reference it for iron-binding capacity and related measurements, underlining its broad base of acceptance.
Longitudinal studies tracking groundwater metal contamination have relied on Xylenol Orange-based colorimetry since the 1980s. From field collections in developing countries to lab-scale verification runs in major research centers, its performance underlines why so many groups still rely on it. This isn’t a result of manufacturer hype, but real validation across thousands of tests and dozens of unique site conditions.
Laboratories face resource limits regardless of location. Many technical problems—from continual restandardization to sample re-testing—bring both cost and delay. The daily drudgery of remaking unstable indicator solutions or tinkering with pH buffers turns into lost productivity. Xylenol Orange saves time when its stability cuts down on remakes, and its predictable endpoint eliminates reruns. During audits, it’s a relief to show consistent historical records that don’t shift every time a new staff member takes over the process.
Samples can vary in organic content, particulate matter, and ion balance. In those moments, having a reagent that gives reliable color shifts becomes more than a textbook requirement—it’s the difference between actionable data and inconclusive results. Whether handling low-concentration monitoring wells, high-throughput plant effluents, or clinical testing on a tight timeline, staff quickly discover the value in a chemical that “just works” regardless of minor variations in sample quality.
You only have to spend a handful of years in analytical chemistry to appreciate the cumulative trust in select methods—and Xylenol Orange Tetrasodium Salt earns its place among them. Its namesake color signals clear endpoints in classrooms, regional water labs, and sprawling environmental monitoring programs. Rather than depending on rare or expensive reagents, this compound brings proven results without unnecessary expense or steep learning curves. Lab veterans often remember their “first successful titration” by the orange-pink solution twisting to a clear endpoint, forever linking the chemical to confidence and competence.
Young engineers and seasoned QA managers both benefit from this established reliability. The more users share positive outcomes—clean, quantifiable results without excessive controls—the more a product confirms its essential role. At a time when funds are tight and outcomes subject to intense scrutiny, reaching for an indicator with a proven track record provides an anchor in the sea of daily work.
Modern labs need more than accuracy—they demand chemicals that fit ethical and environmental norms. Xylenol Orange Tetrasodium Salt, by design, produces less hazardous waste than many other dyes. Its strong color response means smaller quantities suffice, reducing overall chemical volume in the waste stream. Municipal and university labs committed to green chemistry principles benefit from this reduced environmental load.
Disposal requirements for Xylenol Orange solutions are straightforward, usually following standard aqueous waste protocols. It avoids persistent organic pollutants (POPs), a growing concern in chemical selection for regulatory compliance. Lab managers often weigh the net impact of widespread, repeat use across the year; a reagent like this reduces the cumulative environmental and financial footprint.
Lab safety officers also point to the advantage of avoiding heavy-metal-based indicators. Less reliance on toxic components makes for a safer working space and fewer headaches at inspection time. The direct, bright color readout minimizes the need for subjective interpretation or excessive dilution, so exposure stays low and safety standards remain in reach.
One of the less-discussed strengths of Xylenol Orange Tetrasodium Salt comes from its accessibility. Globally, not every institution enjoys generous budgets or ready access to the latest analytical gadgets. Key reagents must be affordable, easily shipped, and usable with basic laboratory tools. A packet of Xylenol Orange can deliver hundreds of tests using glassware and a simple spectrometer—a feature that democratizes accurate analysis.
Technical education relies on clarity at every step. I remember watching students struggle to identify faint endpoint changes with lesser indicators, only to walk out of class disheartened. In contrast, the unmistakable color transition with Xylenol Orange restores a sense of discovery and pride. This accessibility feeds into improved training, wider dissemination of best practices, and tangible gains in scientific literacy worldwide.
No product is a panacea. Some rare sample types may still pose interference—high organic content, unusual chelators, or surfactant-heavy mixtures can blunt even strong colorimetric responses. A common-sense approach avoids blind faith in any one reagent, and Xylenol Orange’s value grows when paired with regular validation checks and appropriate sample pretreatment. Research continues to address niche interactions, broadening the already-ample scope of reliable use.
In the few scenarios where spectral overlap exists, confirmatory tests or method modifications can help. Transparent record-keeping and systematic method optimization ensure that the indicator’s strengths don’t become overlooked in pursuit of perfect universality. The product remains a go-to choice, but users always benefit from deeper engagement with their applications and careful review of their standard operating procedures.
Laboratory science evolves with new technology. Xylenol Orange’s robustness keeps it relevant even as automation and high-sensitivity instruments become commonplace. Method developers continue to incorporate its stability and specificity into automated formats, making large-scale, low-error testing attainable for institutions at every level. The blending of classic reagents with modern protocols enhances the reliability of both fields—traditional chemistry and advanced robotics—bringing accuracy and efficiency together.
Many users also explore combined reagents or buffer systems to further minimize rare interferences. Published method improvements adapt Xylenol Orange into fresh test kits, microplates, flow-through cells, and portable field analyzers. This ability to expand and adapt only strengthens the case for keeping the tetrasodium salt form at the core of both classic titrimetric and contemporary high-throughput workflows.
For those seeking results they can explain, defend, and repeat, Xylenol Orange Tetrasodium Salt holds a well-deserved reputation. Its straightforward nature keeps complex projects moving forward, and its decades-long catalog of successful tests inspires confidence up and down the chain—from student to senior scientist. The lessons from my own apprentice years—reliable endpoints, happy lab managers, and audits free of explanation—echo the experience of countless others worldwide.
Ultimately, greater accuracy in metal ion analysis supports everything from clean water to safe medications. Science often advances with quiet, everyday improvements, not flashy new compounds. Xylenol Orange’s enduring role comes down to something rare and valuable: long-term trust built on lived experience. In a field crowded by choices, that’s an outcome worth holding onto.
