System blank and system recovery rate are two critical performance indicators for Combustion Ion Chromatography (CIC) systems.

1. System blank directly determines the detection limit and measurement accuracy of the instrument.A high system blank means strong background interference, which will cover up low-concentration samples and lead to false high results or failure to detect trace elements accurately. Only a low and stable system blank ensures reliable analysis of trace halogens, sulfur, and nitrogen in samples.

2. System recovery rate reflects the integrity of the entire combustioninjectiondetection process.It verifies whether the target components are completely burned, fully absorbed, and accurately detected without loss or contamination. A qualified recovery rate proves that the analytical process is authentic, effective, and traceable, which is essential for quality control and compliance testing.

Together, they guarantee the accuracy, reliability, and repeatability of CIC test results, which are especially critical for environmental monitoring, quality inspection, and material safety testing.

Let's see system blank and system recovery  on 

Sundy SDXNS200H Combustion Ion Chromatography.

System blank test

Test results

Standard solution recovery test

Test results

A sample is burned together with a known substance (e.g., Benzoic Acid，lens paper,ect.), and after burning the mixture, the known substance's calorific value is subtracted from the result, yielding the low calorific value. Sundy calorimeter software has an input interface for additives (e.g., Benzoic Acid，lens paper,ect.), ,so it can automaticlly caculate final result of low calorific value sample for our user.