GB/T 23349-2020Determination of arsenic,cadmium,chromium,lead and mercury contents for fertilizers (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 23349-2009 "Ecological indicators of arsenic, cadmium, lead, chromium, and mercury in fertilizers". Compared with GB/T 23349-2009, In addition to editorial changes, the main technical changes are as follows.

---The detection limit of the method has been increased (see Chapter 1);

---Deleted limit requirements and inspection rules (see Chapter 3 and Chapter 5 of the 2009 edition);

---The atomic fluorescence spectrometry method of arsenic and mercury has been added (see 3.2.2 and 3.6.2).

1 Scope

This standard specifies methods for determining the content of arsenic, cadmium, chromium, lead and mercury in fertilizers.

This standard applies to the determination of arsenic, cadmium, chromium, lead and mercury content in fertilizers.

The detection limit of this standard method is. arsenic. 0.8mg/kg for silver diethyldithiocarbamate spectrophotometry, and atomic fluorescence spectrometry for 0.1µg/kg, cadmium is 0.4mg/kg, chromium is 0.1mg/kg, lead is 1mg/kg, mercury. hydride generation-atomic absorption spectrophotometry is 0.1mg/kg, 0.05µg/kg by atomic fluorescence spectrometry.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.

For undated references, the latest version (including all amendments) applies to this document.

HG/T 2843 Commonly used standard titration solution, standard solution, reagent solution and indicator solution for chemical analysis of fertilizer products

NY/T 1978-2010 Fertilizer determination of mercury, arsenic, cadmium, lead, and chromium content

3 Test method

The preparation of reagents, water and solutions used in this standard shall be in accordance with HG/T 2843 when specifications and preparation methods are not indicated.