Phthalate plasticizer testing is the laboratory determination of the concentration of phthalate ester plasticizers (邻苯二甲酸酯, PAEs) — industrial additives used to make PVC and other plastics flexible — in food, food-contact materials, toys, consumer products, and electronic equipment. The test is governed by a matrix-specific GB framework that splits along the food/product boundary: food-contact materials under GB 31604.30-2025 (just published, expanded to 19 phthalates), food itself under GB 5009.271-2016 (replacing the withdrawn GB/T 21911-2008), and the permitted-use and migration-limit framework under GB 9685-2016 (with its 2025 amendment). In electronics, phthalates are now among the 10 restricted substances of the updated GB 26572-2025 (China RoHS, expanded from 6 to 10). The defining compliance trait is that phthalates are "environmental hormones" with endocrine-disrupting effects — regulated not as acute toxins but as chronic endocrine disruptors — and the test must be GC-MS specific because the 19+ structurally similar esters require mass-spectrometric identification beyond chromatographic retention alone.
Why Phthalates Are Regulated — the Environmental-Hormone Basis
Phthalate esters (PAEs) are not acute poisons; they are endocrine-disrupting chemicals ("environmental hormones"). Chronic exposure interferes with the reproductive and endocrine systems — DEHP and DBP have documented anti-androgenic effects (reduced testosterone, impaired sperm, developmental reproductive effects). The European food safety Authority (EFSA) set tolerable daily intakes of 0.05 mg/kg body weight for DEHP and 0.01 mg/kg bw for DBP. Because the hazard is cumulative and chronic, the regulatory approach is not a simple presence/absence but specific migration limits (SMLs) in food-contact materials and content limits in consumer products.
The Matrix-Specific GB Framework
Phthalates are governed by different standards depending on what is being tested:
| Matrix | Standard | What is measured |
|---|---|---|
| Food-contact materials | GB 31604.30-2025 (19 phthalates, replaced 2016) + GB 9685-2016 (permitted list + SML) | Residual content + migration to food simulants |
| Food | GB 5009.271-2016 (replaced GB/T 21911-2008) | Phthalate content in the food |
| Toys & children's products | GB 6675 + GB/T 22048 | Migrated phthalate content |
| Electronics (RoHS) | GB 26572-2025 (expanded 6→10 substances) | DEHP, BBP, DBP, DIBP ≤ 1000 mg/kg each |
| Cosmetics | Safety and Technical Standards for Cosmetics (2015) | Prohibited as intentional ingredients |
Food-Contact Materials: GB 31604.30-2025
GB 31604.30-2025 (食品安全国家标准 食品接触材料及制品 邻苯二甲酸酯的测定和迁移量的测定) is the newly-published method standard, published 2025-03-16, implementing 2025-09-16, replacing GB 31604.30-2016. The 2025 revision expanded the analyte panel to 19 phthalate esters (the "邻苯19P" panel), adding DIDP and other compounds to the 2016 edition's coverage. The standard has two parts:
- Part 1 — Residual content (残留量): the total phthalate content in the material itself (plastic, rubber, coatings, adhesives), by GC-MS after solvent extraction. Applied to the raw material.
- Part 2 — Migration (迁移量): the amount of phthalate that migrates from the material into food simulants (water, 3% acetic acid, 10%/20% ethanol, vegetable oil), by GC-MS after exposure under defined time/temperature conditions. Applied to the finished product in contact with food.
The migration test is the compliance test — it measures what the consumer actually ingests, not what is in the plastic.
The GB 9685-2016 Permitted-Use Framework
GB 9685-2016 (食品接触材料及制品用添加剂使用标准, Standard for the Use of Additives in Food Contact Materials and Products) governs which phthalates may be used in food-contact materials and at what migration limit. Only 6 phthalates are on the permitted-use list (including DEHP, DBP, DINP, DIDP), each with a specific migration limit (SML) and a maximum use level in the material. The 2025 amendment to GB 9685 eliminated 13 high-risk additives and tightened the migration limits, further restricting phthalate use in food-contact applications. Phthalates not on the list are not permitted in food-contact materials.
Food: GB 5009.271-2016
For phthalates that have migrated into food, GB 5009.271-2016 (食品安全国家标准 食品中邻苯二甲酸酯的测定) is the current method, replacing the withdrawn GB/T 21911-2008 (废止 2017-12-30). The method covers 18 phthalate esters by GC-MS, with detection limits of ~1.5 mg/kg for fatty foods and ~0.05 mg/kg for non-fatty foods. Because phthalates are fat-soluble, oily foods (edible oils, dairy, baked goods with oil) are the highest-risk matrices — plastic-packaged vegetable oil is considered the primary human exposure route.
Electronics: GB 26572-2025 (China RoHS)
The 2025 revision of GB 26572 (China RoHS) expanded the restricted substances from 6 to 10 by adding four phthalates: DEHP, BBP, DBP, and DIBP — each limited to ≤ 1000 mg/kg (0.1 %). These are the same four phthalates added to the EU RoHS (Directive 2015/863). The test method is GB/T 39560 (IDT IEC 62321) series. See the RoHS test article for the full multi-substance framework.
The Analytical Method: GC-MS
gas chromatography–mass spectrometry (GC-MS) is the universal phthalate method, for reasons the search results don't explain:
- Why GC-MS, not GC-FID or HPLC alone? Because the 19 phthalate esters are structurally similar (all are ortho-dicarboxylic acid diesters of varying alcohol chains), their chromatographic retention times can overlap. mass spectrometry provides the molecular-ion and fragmentation-pattern identification that resolves co-eluting isomers (e.g., DINP from DIDP, DnOP from DEHP) that GC-FID cannot distinguish. The characteristic ions (m/z 149 for the common phthalic anhydride fragment, plus the molecular ion) confirm identity.
- Sample preparation — solvent extraction (for materials) or food-simulant exposure followed by extraction (for migration); SPE cleanup for complex matrices.
- Internal standards — deuterated phthalate internal standards (e.g., DEHP-d4, DBP-d4) for quantification accuracy.
The 2011 Taiwan Plasticizer Scandal
The event that catalyzed China's current phthalate-testing infrastructure was the 2011 Taiwan plasticizer scandal (塑化剂事件), in which illegal phthalate plasticizers (mainly DEHP and DINP) were used as clouding agents in beverages, jams, and food supplements, replacing the legitimate palmitic acid ester. The scandal triggered a massive food-safety crisis, led to the rapid development of GB/T 21911-2008 and then GB 5009.271-2016 as food-screening methods, and established phthalates as a routine food-contamination target in China — a status the preceding regulations had not anticipated.
Why the Search Results Are Off the Compliance Intent
The search results for "phthalate plasticizer testing" are dominated by content that does not frame the GB compliance structure:
- Alfa Chemistry food-plasticizer testing service — describes GC, HPLC, GC-MS, LC-MS, ELISA methods for phthalates in food, but cites no GB standard and frames it as a general analytical service. Lab-service content, zero GB.
- Berkeley Analytical (US CPSC-accepted lab) — phthalate testing for consumer products per CPSC-CH-C1001-09.4 and EPA 8270E, 11 phthalates at 500 ppm reporting limit. US CPSC framework, zero GB.
- General phthalate-testing lab pages — cite US CPSIA, EU REACH, California Prop 65. Western regulation, zero GB.
None tells a food-packaging manufacturer, a toy maker, an electronics producer, or a food-safety lab which GB standard governs their phthalate test, what the GB 31604.30-2025 expansion to 19 phthalates means, or what the GB 9685 SML limits are. That compliance question is what this article addresses.
Our Testing Capabilities
Beijing ZKGX Research conducts phthalate plasticizer testing across the matrix-specific GB framework:
- Food-contact materials (GB 31604.30-2025 + GB 9685-2016): residual content (Part 1, 19 phthalates by GC-MS) and migration to food simulants (Part 2), against the GB 9685 permitted-use list and SML limits.
- Food (GB 5009.271-2016): 18 phthalate esters by GC-MS, with matrix-specific detection limits, for edible oils, dairy, beverages, baked goods, and other food matrices.
- Electronics (GB 26572-2025 / GB/T 39560): DEHP, BBP, DBP, DIBP at ≤1000 mg/kg as part of the RoHS test panel.
- Toys & children's products (GB 6675 / GB/T 22048): migrated phthalate content for toy safety compliance.
- Cosmetics: phthalate screening for prohibited-substance compliance.
- Method: GC-MS (SIM mode, m/z 149 + molecular ions) with deuterated internal standards, for all matrices.
- Deliverable: a test report stating the matrix, the standard applied (GB 31604.30-2025 / GB 5009.271-2016 / GB 9685 / GB 26572), the phthalate panel and individual values, the migration results where applicable, and pass/fail against the SML or content limit.
If you have a food-contact material, food product, electronic product, or toy requiring phthalate verification, contact our testing team to scope the matrix, the applicable GB standard, and the required phthalate panel.
Frequently Asked Questions
What standard governns phthalate testing?
It depends on the matrix. Food-contact materials are under GB 31604.30-2025 (19 phthalates, replaced 2016) and GB 9685-2016 (permitted list + SML). Food is under GB 5009.271-2016 (replaced GB/T 21911-2008). Electronics are under GB 26572-2025 (RoHS, 4 phthalates ≤1000 mg/kg). Toys are under GB 6675 / GB/T 22048.
What replaced GB 31604.30-2016?
GB 31604.30-2016 was replaced by GB 31604.30-2025, published 2025-03-16, implementing 2025-09-16. The 2025 edition expanded the analyte panel to 19 phthalate esters (adding DIDP and others) and refined the residual-content (Part 1) and migration (Part 2) methods. A current food-contact-material report cites GB 31604.30-2025.
What replaced GB/T 21911-2008?
GB/T 21911-2008 (食品中邻苯二甲酸酯的测定) was withdrawn (废止 2017-12-30) and replaced by GB 5009.271-2016 (食品安全国家标准 食品中邻苯二甲酸酯的测定), covering 18 phthalate esters by GC-MS with improved detection limits. A current food phthalate report cites GB 5009.271-2016.
Why is GC-MS used for phthalates instead of GC-FID?
Because the 19 phthalate esters are structurally similar (ortho-dicarboxylic acid diesters), their chromatographic retention times overlap. Mass spectrometry provides the molecular-ion and fragmentation-pattern identification (characteristic m/z 149 fragment + molecular ion) that resolves co-eluting isomers (DINP vs DIDP, DnOP vs DEHP) that GC-FID cannot distinguish.
How many phthalates are restricted under China RoHS?
Under GB 26572-2025 (China RoHS, expanded 6→10 substances), four phthalates are restricted: DEHP, BBP, DBP, and DIBP, each at ≤ 1000 mg/kg (0.1 %). These are the same four added to EU RoHS (Directive 2015/863). The test method is GB/T 39560 (IDT IEC 62321).