GB17378.4-2007
The specification for marine monitoring - Part 4：Seawater analysis
海洋监测规范 第4部分: 海水分析
GB 17378.4-2007 is a current mandatory Chinese national standard for The specification for marine monitoring - Part 4：Seawater analysis. It appears in the Environment compliance cluster with a environmental protection focus and has an implementation date of May 1, 2008.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
GB 17378.4-2007 specifies the analytical methods for seawater monitoring and is mandatory in its entirety. It applies to ocean waters, nearshore waters, estuarine waters, and brackish-freshwater mixing zones. The standard is used for marine environmental monitoring, routine water quality monitoring, nearshore pollution surveys, and emergency investigations related to marine dumping, dredging, red tide events, and marine pollution accidents. It is not applicable to freshwater-only bodies or industrial wastewater discharge standards. All technical content in this standard is mandatory for organizations conducting marine monitoring in China.
Technical requirements
This standard specifies analytical methods for over 40 seawater parameters, organized into distinct categories. For heavy metals, it covers mercury (by atomic fluorescence, cold atomic absorption, and gold-trap cold atomic absorption), copper, lead, cadmium, zinc, total chromium, arsenic, selenium, and nickel—each with multiple analytical methods including flameless atomic absorption spectrophotometry, flame atomic absorption, anodic stripping voltammetry, and catalytic polarography. For each parameter, at least one method is designated as the arbitration method for dispute resolution. For organic pollutants, the standard specifies gas chromatography methods for organochlorine pesticides (BHC/HCH and DDT isomers), polychlorinated biphenyls (PCBs), and dieldrin, utilizing resin adsorption, solvent extraction, and silica gel column purification procedures. Oil and grease analysis is covered by fluorescence spectrophotometry, UV spectrophotometry, and gravimetric methods. For nutrients and water quality indicators, the standard addresses active silicate, sulfide, volatile phenols, cyanide, anionic surfactants, ammonia nitrogen, nitrite, nitrate, inorganic phosphorus, total phosphorus, and total nitrogen. Physical and chemical parameters include water color, transparency, pH, suspended matter, chlorides, salinity, turbidity, dissolved oxygen, chemical oxygen demand (COD), biochemical oxygen demand (BOD₅ and BOD₂), and total organic carbon (TOC). The standard also provides general provisions for reagent purification, blank correction procedures, salinity error correction, sample volume correction, and method validation requirements. Appendices specify standardized recording forms (Appendix A), sample collection/storage/transport requirements (Appendix B), method detection limits (Appendix C), and preparation of working sub-standard seawater (Appendix D).
Testing methods
The standard employs a diverse range of analytical techniques: Atomic Fluorescence Spectrometry (for Hg and As), Cold Atomic Absorption Spectrophotometry (for Hg), Flameless/Flame Atomic Absorption Spectrophotometry (for Cu, Pb, Cd, Zn, Cr, Ni), Anodic Stripping Voltammetry (for Cu, Pb, Cd, Zn), Catalytic Polarography (for As, Se), Gas Chromatography with ECD (for organochlorine pesticides, PCBs, dieldrin), Fluorescence Spectrophotometry (for Se, oils), UV-Vis Spectrophotometry (for silicate, sulfide, phenols, cyanide, nutrients, chromium), Gravimetric Analysis (for suspended matter, oils), Iodometric Titration (for dissolved oxygen, COD), Silver Nitrate Titration (for chlorides), pH Meter Method, Salinometer and CTD methods (for salinity), and Turbidimetry. Each method includes detailed procedures for standard curve preparation, sample digestion/extraction, and calculation formulas with specified precision and accuracy requirements.
FAQs
What products or activities are regulated under GB 17378.4-2007?
GB 17378.4-2007 is not a product standard but a mandatory analytical methods standard for seawater monitoring. It applies to organizations conducting marine environmental monitoring, pollution surveys, and emergency response investigations in Chinese waters. Any entity performing seawater quality analysis in China must use the methods specified in this standard.
What are the key updates in GB 17378.4-2007 compared to the 1998 version?
Major updates include: addition of atomic fluorescence methods for mercury and arsenic; modification of flameless AAS methods for simultaneous determination of Cu, Pb, and Cd; addition of CTD method for salinity; addition of TOC instrument method; addition of total phosphorus and total nitrogen methods (persulfate oxidation); addition of nickel determination; removal of several outdated methods (dithizone spectrophotometry for Hg, Cu, Pb, Cd, Zn; Freon-cyclohexane fluorescence for oils; pH colorimetric method); and reorganization of appendices.
How does GB 17378.4-2007 relate to international standards?
Several methods in this standard are equivalent to internationally recognized classical methods. For example, the CTD method for salinity (Section 29.2) and the zinc-cadmium reduction method for nitrate (Section 38.2) are equivalent to GB/T 12763.2 and GB/T 12763.4 (Chinese national standards for oceanographic survey). The salinity calculation follows the UNESCO Practical Salinity Scale (PSS-78) using international oceanographic tables. However, the standard is specifically tailored for Chinese marine monitoring requirements and may differ from ISO methods in procedural details.
The summary above provides a high-level overview of GB 17378.4-2007. To ensure complete compliance for your marine monitoring projects in Chinese waters, a precise and professional translation of the full technical specifications—including all reagent preparation procedures, detailed analytical steps, calculation formulas, precision data, and standardized recording forms—is essential. Purchase our high-quality English translation of GB 17378.4-2007 today to access all detailed parameters, tables, and testing procedures. Our translation is performed by technical experts fluent in both marine chemistry and Chinese regulatory standards, ensuring accuracy for your compliance needs.
Applicability hints
- Type
- Environmental protection
- CCS
- A45
- ICS
- 07.060
- Competent department
- Ministry of Natural Resources (Marine)
- Technical committee
- National Technical Committee on Marine of Standardization Administration of China
Relationships
Replaces:GB 17378.4-1998