GB17378.2-2007
The specification for marine monitoring - Part 2：Data processing and quality control of analysis
海洋监测规范 第2部分: 数据处理与分析质量控制
GB 17378.2-2007 is a current mandatory Chinese national standard for The specification for marine monitoring - Part 2：Data processing and quality control of 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 17378.2-2007 applies to data processing and internal analytical quality control in marine environmental monitoring, including seawater analysis, sediment analysis, biological tissue analysis, offshore pollution ecological investigation, and biological monitoring. It may also be referenced for marine atmospheric monitoring, pollutant flux surveys, marine dumping, and dredging investigations. This standard is mandatory for all laboratories conducting marine environmental monitoring in China. It does not apply to field sampling procedures or specific analytical measurement methods, which are covered in other parts of the GB 17378 series.
Technical requirements
The standard defines critical terminology for marine monitoring data handling, including standard blank, analysis blank, calibration curve, detection limit (X_N), and limit of determination (X_B). It establishes rules for recording and rounding significant figures based on instrument precision, and specifies that results below the detection limit must be reported as "undetected" with defined statistical treatment for regional monitoring datasets. The standard mandates statistical outlier testing using methods such as the Dixon test, Grubbs test, and Cochran maximum variance test to identify and handle anomalous data. It sets clear criteria for retaining or rejecting suspicious data at significance levels of α=0.05 and α=0.01. Laboratories must follow these statistical procedures before accepting or rejecting any analytical data. For significance testing between datasets, the standard prescribes t-test methods (paired data comparison, two-sample mean comparison, and sample mean vs. population mean comparison) and F-test for variance homogeneity. These tests are essential for method comparison, instrument accuracy verification, and recovery rate validation. The standard requires analytical method validation including calibration curve statistical verification, detection limit estimation, and precision/accuracy verification through spiked sample recovery tests. It also mandates the use of quality control charts (mean control charts, mean-range control charts, and recovery rate control charts) for ongoing internal quality control. Each laboratory must validate analytical methods and maintain quality control charts before reporting marine monitoring data.
Testing methods
The standard prescribes several key statistical and quality control procedures: Dixon Q-test for identifying outliers in single datasets; Grubbs test for evaluating consistency across multiple group means; Cochran maximum variance test for checking variance homogeneity among laboratories; t-test (three variants) for comparing paired data, two-sample means, and sample means against known values; F-test for precision comparison between datasets; calibration curve regression analysis including correlation coefficient verification (r ≥ 0.98 for 4-6 concentration points); spiked recovery testing for accuracy validation; and control chart construction (X-bar charts, X-bar-R charts, and P charts) using accumulated internal control sample data over 10-20 days.
FAQs
What products or activities are regulated under GB 17378.2-2007?
GB 17378.2-2007 regulates data processing and analytical quality control procedures for marine environmental monitoring in China. It applies to laboratories performing seawater analysis, sediment analysis, biological tissue analysis, and offshore pollution ecological investigations. It is not a product standard but a procedural standard governing how analytical data must be handled, validated, and quality-controlled.
Are there any significant updates from the previous version GB 17378.2-1998?
Yes, the 2007 version includes several key revisions: revised definitions for standard blank, method sensitivity, detection limit, and limit of determination with clearer probabilistic meanings; updated rules for significant figures including unified exponential notation for trailing zeros; clarified the relationship between outliers and suspicious data; corrected the t-test applicability conditions for two-sided tests; and added a new blank standard deviation method for detection limit estimation in Appendix A.
How does GB 17378.2-2007 relate to international standards?
GB 17378.2-2007 references GB 8170 (Rules for rounding off numerical values) and is part of the seven-part GB 17378 series for marine monitoring. While it employs internationally recognized statistical methods such as Dixon, Grubbs, Cochran, t-test, and F-test procedures, the standard is specifically tailored to Chinese marine monitoring requirements. Laboratories conducting marine monitoring in China must follow this standard regardless of whether they also comply with ISO or other international protocols.
The summary above provides a high-level overview of GB 17378.2-2007. To ensure complete compliance for your marine monitoring laboratory operations in China, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 17378.2-2007 today to access all detailed statistical formulas, critical value tables, control chart construction procedures, and method validation requirements needed for regulatory compliance.
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 17378.2-1998