RB/T 208-2016 in English

VALID

Internal quality control of chemical laboratory―Comparison test

Issued on:2016-12-01
Implemented on:2017-06-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
$156.00

Standard No:	RB/T 208-2016
Document status:	VALID
Title in English:	Internal quality control of chemical laboratory―Comparison test
Title in Chinese:	化学实验室内部质量控制比对试验
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2016-12-01
Implemented on:	2017-06-01
Chinese Classification:	A00-Standardization and Quality Management
Related Topics:	Internal structure of the laboratory chemistry lab chemistry experiment RB∕T Interlaboratory Quality Control chemistry experiment rb/t 195 Comparison Organic Geochemistry Laboratory rb/t 208-2016 rb/t 208 rb/t 190 rb/t 115 p4 laboratory control Comparison scheme indoor vegetable laboratory modern preparation laboratory laboratory nebulization rb/t+208-2016 rb/t+303-2016 Chemical Laboratory Engineering laboratory homogenizer Inter-laboratory comparison of four rb/t 205 rb/t 204 Inter-laboratory comparison or proficiency testing Comparison quality Standard Chemistry Laboratory Series Environmental Chemistry Laboratory Peptide Chemistry Laboratory Comparison with the outside of the laboratory Organic Chemistry Laboratory laboratory comparison test Inter-laboratory comparison information rb/t Laboratory type 2 water quality rab rb ul's laboratories in China laboratory comparison program Test comparison rb/t 116 Mass Spec Lab Gold quality comparison hy/t 208 -2016 Organic 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Introduction

Standard Background and Significance

RB/T 208-2016 is a professional standard for internal quality control of chemical laboratories, issued by the National Certification and Accreditation Administration, filling the gap in systematic quality control methods in the field of chemical testing in my country. This standard is based on the requirements of the GB/T 27025 and GB/T 19000 series of standards, and has formulated operational specifications for key quality control links in daily laboratory testing activities.

Core content analysis

Comparison test type matrix

Comparison type	Applicable scenarios	Evaluation indicators	Critical control points
Personnel comparison	New staff training, subjective judgment items	t-test/allowable difference	Degree of operation standardization
Method comparison	New method verification, multi-standard items	Uncertainty synthesis	Method equivalence verification
Instrument comparison	Equipment acceptance, critical value detection	En value determination	Equipment calibration status

Key points of technical implementation

Sample management specifications

Article 5.3 of the standard clearly requires that the comparison samples must meet the following requirements: homogeneity verification (RSD≤5%), stability monitoring (shelf life verification) and traceability (unique identification). Taking pesticide residue detection as an example, positive samples should pass:

Matrix matching test
-20℃ storage stability verification
Packaging process uniformity test

Statistical evaluation method

The standard innovatively proposes a two-stage evaluation method: first verify the precision through the F test (α=0.05), and then use the t test to evaluate the accuracy. When n＞6, the combined standard deviation is calculated as follows:

s_p = √[((n₁-1)s₁² + (n₂-1)s₂²)/(n₁+n₂-2)]

Implementation Suggestions

Annual Plan Preparation

Covering key test items (accounting for more than 20% of the total)
Including different levels of personnel (new employees/senior personnel)
Setting gradient concentration samples (blank/critical value/positive)

Responses to Common Problems

When unsatisfactory results occur, the four-step troubleshooting method should be implemented: original record review → environmental condition verification → standard material verification → method deviation analysis. For example, a laboratory had a deviation in the heavy metal detection comparison, and it was finally confirmed that it was caused by the contamination of the cone of the inductively coupled plasma mass spectrometer.

More samples: JGJ 94-2008 YD/T 3934-2021 DL/T 5154-2012

Sample only — not a preview of RB/T 208-2016

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