Determination of residual levels of pentachlorophenol and its sodium salt in aquatic products

Pentachlorophenol (PCP) is an important preservative that can prevent fungal growth and inhibit bacterial corrosion. It has been used as a mold inhibitor for leather and wood for a long time, and is effective in controlling mold and general insects such as termites. Its sodium salt is used to eliminate the intermediate host of schistosomiasis, snails, and to control barnyard grass. Sensitive to aquatic animals such as fish, etc., and lethal when the water content reaches 0.1-0.5ppm. Organic drugs can be absorbed through the skin and cause damage to the liver and kidneys. Ingestion can lead to poisoning and, in severe cases, death. But in the past decade, medical research has found that frequent contact with products containing pentachlorophenol (PCP) is highly likely to affect human health, with symptoms including headache, abdominal pain, vomiting, and damage to the central nervous system.

Overview of PCP (Pentachlorophenol):
PCP (pentachlorophenol) is a commonly used anti mold and preservative in textiles, leather products, wood, weaving pastes, and printing pigments. Function: 1. Mold proof 2. Anti corrosion 3. Insect proof 4. Sterilization.
2. Hazards of PCP (pentachlorophenol):
Animal experiments have shown that PCP (pentachlorophenol) is a highly toxic substance that is teratogenic and carcinogenic to humans. When humans wear textiles with residual PCP (pentachlorophenol), it can accumulate in the human body through the skin, posing a health threat to humans. Additionally, PCP releases notorious dioxin like compounds when burned, causing long-lasting damage to the environment.
3. Limitation of PCP (pentachlorophenol):
The ecological textile standards in China and the OEKO tex standard 100 of the International Ecological Textile Association both stipulate a limit of no more than 0.5mg/kg (0.05mg/kg for infant and toddler products) for PCP residues in textiles.
The LFGB regulation limits PCP to no more than 0.1mg/kg.
Testing standards:
GB/T 22808-2008 Leather and Fur Chemical Tests - Determination of Pentachlorophenol Content
GB/T 25002-2010 Determination of Pentachlorophenol in Water Extracts of Paper, Paperboard and Pulp
LY/T 1985-2011 Method for determination of pentachlorophenol content in anti-corrosion wood and artificial board
SC/T 3030-2006 Determination of residual pentachlorophenol and its sodium salt in aquatic products Gas chromatography method
SN/T 2204-2008 Food contact materials - Determination of pentachlorophenol in wooden food simulants - Gas chromatography-mass spectrometry method

Instrument:
1. GC-9860-- IV gas chromatograph, equipped with ECD electron capture detector
2. Specialized chromatographic column: 35% polydiphenyldimethylpolysiloxane, 30m × 0.25mm × 0.25um
3. Centrifuge, homogenizer, vortex mixer, analytical balance and other equipment
Chromatographic conditions:
Column temperature: Initial temperature of 140 ℃, hold for 2 minutes, increase to 200 ℃ at a rate of 10 ℃/min, hold for 7 minutes, increase to 260 ℃, hold for 3 minutes; Detector temperature: 300 ℃; The temperature of the sampler is 250 ℃. Carrier gas: Nitrogen

GC-9860-- IV gas chromatograph (high-end type)
On the occasion of the successful launch of the GC-9860 series network gas chromatograph for 5 years, we have lived up to expectations by conquering the GC-EPC (EFC) technology and successfully developing the GC-9860-IV networked gas chromatograph with full EPC technology! Breaking the situation where foreign chromatography manufacturers rely on EPC technology to dominate the high-end market in China!
Successfully developed a networked workstation with independent intellectual property rights - NETchromTM. Becoming one of the few domestic enterprises with both chromatographic and workstation research and development capabilities. And successfully integrated Modbus/TCP and Profibus protocols into the chromatography system - users can connect the chromatographic data analyzed online to DCS (Distributed Control System). Make chromatographic analysis results no longer just traditional paper reports, but important parameters for computer recognition and control in the production process. Implemented automatic detection, automatic adjustment, automatic protection, and automatic operation! Thoroughly changed the original and outdated analysis and testing status of manual sampling, manual injection, and manual data copying.
Your expectations, our efforts... Domestic full EPC models!

Instrument features:
● The 10/100M adaptive Ethernet communication interface with advanced technology is adopted, and the IP protocol stack is built in, so that the instrument can easily realize long-distance data transmission through the enterprise internal LAN and Internet; Convenient laboratory setup, simplified laboratory configuration, and data management;
Three independent connection processes are designed inside the instrument, which can be connected to local processing, unit supervisors (such as chief engineer, technical factory director, etc.), and higher-level supervisors (such as environmental protection bureau, technical supervision bureau, etc.), making it convenient for unit supervisors and higher-level supervisors to monitor the operation of the instrument in real time and analyze data results;
The NETChromTM workstation equipped with the instrument can support up to 253 chromatography machines working simultaneously, achieving data processing and control, reaching an industry-leading level;
The Modbus/TCP server built into the NETChromTM workstation allows for easy integration of analysis results into DCS (Distributed Control System);
The instrument adopts vacuum fluorescence display technology, which is high-end and atmospheric, and the interface operation is convenient and simple; Capable of operating in both Chinese and English to meet different user needs;
The instrument adopts a modular structural design, which is clear in design, easy to replace and upgrade, and protects the effectiveness of investment; It can meet the analysis of complex samples and can be equipped with various high-performance detectors such as FID, TCD, ECD, FPD, and NPD;
Completely abandoning traditional mechanical valves and pointer pressure gauges! The use of EPC technology for gas path control has improved the automation level of gas chromatography. It has achieved automatic protection for gas path faults, automatic ignition, automatic key shutdown, and automatic execution of gas path opening, achieving one key start;
The instrument is designed with a timed self starting program, which can easily complete online analysis of gas and liquid samples (with injection components required);
The system is designed with an automatic sampler interface to facilitate the connection and future upgrades of the automatic sampler;

Main technical indicators:
● Operation display: Vacuum fluorescent display screen
Temperature controlled area: 6 channels
Temperature control range: 4 ℃ to 450 ℃ above room temperature, increment: 1 ℃, accuracy: ± 0.1 ℃
● Program heating order: 16 orders
● Lift rate: 0.1-39 ℃/min (ordinary type); 0.1-80 ℃/min (high-speed type)
External events: 8 channels; 4 auxiliary control outputs
● Sample injector types: packed column injection, capillary injection, six way valve gas injection, automatic headspace injection optional
Number of detectors: 3 (maximum); (FID, TCD, ECD, FPD, NPD) optional
● Gas path control: Full EPC
EPC and EFC working modes: 2 types; Constant current mode, constant voltage mode
EPC and EFC working gases: 5 types; Nitrogen, hydrogen, air, helium, argon
EPC and EFC lift: 4th order
EPC and EFC control range:
Pressure: 0-0.6MPa; Flow rate 0-100 sccm or 0-500 sccm (air)
EPC and EFC control accuracy: pressure 0.01KPa; Flow rate of 0.01 sccm
● Pressure sensor:
Accuracy:<± 2% of full scale
Reproducibility:<± 0.05 KPa
Temperature coefficient:<± 0.01 KPa/° C
Range: 0-0.3MPa or 0-0.6MPa;
● Flow sensor:
Accuracy:<± 5% of full scale
Reproducibility:<± 0.5% (full scale)
Range: 0-500sccm
● Start injection: (manual, automatic, syringe automatic detection) optional
● Communication interface: Ethernet: IEEE802.3

Hydrogen flame ionization detector (FID)
Detection limit: Mt ≤ 3 × 10-12g/s (n-hexadecane-isooctane solution);
Baseline noise: ≤ 5 × 10-14A
Baseline drift: ≤ 1 × 10-13A/30min
● Linear range: ≥ 106
Maximum operating temperature: ≤ 450 ℃

Thermal conductivity detector (TCD)
Sensitivity: S ≥ 3500mV • ml/mg (n-hexadecane isooctane solution) (amplification 1, 2, 4, 8 times optional)
Baseline noise: ≤ 10 μ V
Baseline drift: ≤ 30 μ v/30min
● Linear range: ≥ 104

Electron Capture Detector (ECD)