chemistry

Triphenyl phosphate

Triphenyl phosphate is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Triphenyl phosphate rather than just read about it. In short: Triphenyl phosphate (TPhP) is the chemical compound with the formula OP(OC6H5)3. It is the simplest aromatic organophosphate.

Key takeaways

Triphenyl phosphate belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Triphenyl phosphate to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Triphenyl phosphate from memory before moving on to harder problems.

Reference excerpt

Triphenyl phosphate (TPhP) is the chemical compound with the formula OP(OC6H5)3. It is the simplest aromatic organophosphate. This colourless solid is the ester (triester) of phosphoric acid and phenol. It is used as a plasticizer and a fire retardant in a wide variety of settings and products.

Preparation Triphenyl phosphate is prepared by the SN2 reaction of phosphorus oxychloride and phenol.

Uses Triphenyl phosphate has been used widely as a flame retardant and plasticizer. It has been used as a flame retardant for a variety of materials, including electronic equipment, PVC, hydraulic fluids, glues, in nail polishes, and casting resins. Its mechanism of action as a flame retardant is as follows: first, during thermal decomposition, phosphoric acid is formed. This reacts to form pyrophosphoric acid, which, when in its condensed phase, acts to block heat transfer. One of the most effective flame retardants for certain polymers, TPhP is only active as an additive flame retardant in its gas phase. Phase out of PBDEs may have increased the use of TPhP in recent years. TPhP is also used as a plasticizer in lacquers, varnishes, and hydraulic fluids. Nail polish has received particular interest as a source of exposure to TPhP.

Toxicology Limited information is available indicating significant toxicological effects of TPhP. Although it was initially expected to have an overall low impact, a growing body of evidence suggests that the effects may not be so harmless. Triphenyl phosphate exhibits low acute toxicity by dermal or oral contact. However, an increasing number of studies have linked exposure to TPhP with reproductive and developmental toxicity, neurotoxicity, metabolic disruption, endocrine effects, and genotoxicity. TPhP has also been found to induce significant estrogenic activity. One study found that concentrations above the lowest observable effect level have been observed in a variety of other studies in coral grouper, yellow striped goat fish, and freshwater perch. This indicates that TPhP may be present in the environment at high enough concentrations to have harmful ecological effects. The European Chemicals agency considers TPhP to be "very toxic" to aquatic life, with potentially long-lasting effects. In contrast to many persistent organic pollutants, TPHP has limited affinity for lipids. Still, bioaccumulation of the compound has been found to occur at varying levels in fish, with the strongest patterns showing up based on gender, feeding patterns, and metabolic efficiency. However, the mechanisms explaining why and how TPhP accumulates in this manner are not yet known.

Environmental transport and transformations Triphenyl phosphate has been detected in the environment. Other triaryl phosphates have been known to enter aquatic environments through volatilization and leaching from plastics, through hydraulic fluid leakages, and, to a lesser degree, through manufacturing processes. TPhP, in particular, has been found to enter the environment through industrial use, as in the manufacturing process, and through indoor use, for example through paints and electronic equipment. As with many other phosphorus-containing flame retardants, TPhP has been found widely in sediment, soil, indoor dust, and air. Once in water, TPhP has been found to biodegrade relatively quickly under both aerobic and anaerobic conditions, and does not meet criteria for being categorized as persistent. However, although the compound biodegrades easily and does not bioaccumulate, it is readily detected because of the sheer volume that is utilized. In 2014, the United States Environmental Protection Agency added TPhP to its list of Toxic Substance Control Act Work Plan for Chemicals on the basis that the compound has exhibited "acute and chronic aquatic toxicity," "moderate bioaccumulation potential," and "moderate environmental persistence." Still, there is not yet enough information to fully assess the environmental impact of TPhP.

References

Illustrations

Worked examples

Example 1 — a first encounter with Triphenyl phosphate

Start with the simplest possible case. Write down what Triphenyl phosphate claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Triphenyl phosphate before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Triphenyl phosphate ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Triphenyl phosphate

In research: Triphenyl phosphate appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Triphenyl phosphate in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Triphenyl phosphate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aromatic compounds, Flame retardants, Organophosphates, so understanding it makes those chapters shorter.
In everyday life: Look for Triphenyl phosphate outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Triphenyl phosphate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Triphenyl phosphate means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Triphenyl phosphate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Triphenyl phosphate in simple terms?

Triphenyl phosphate (TPhP) is the chemical compound with the formula OP(OC6H5)3. It is the simplest aromatic organophosphate.

Why does Triphenyl phosphate matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Triphenyl phosphate?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Triphenyl phosphate.