Aspect AS106 concentration

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      "casts": [],
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      "ml_name": "ra_ip_lb.gal_US-1",
      "scale_type": "ratio",
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    },
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          "src_scale_id": "SC841",
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          "aspect_id": "AS106"
        },
        {
          "src_scale_id": "SC841",
          "dst_scale_id": "SC839",
          "aspect_id": "AS106"
        }
      ],
      "casts": [],
      "id": "SC841",
      "ml_name": "#N/A",
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    },
    {
      "prefix": null,
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        {
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          "aspect_id": "AS106"
        }
      ],
      "casts": [],
      "id": "SC839",
      "ml_name": "ra_ip_oz_av.gal_US-1",
      "scale_type": "ratio",
      "is_systematic": null
    }
  ],
  "id": "AS106",
  "name": "concentration",
  "ml_name": "as_concentration",
  "symbol": null,
  "reference": "NIST Special Publication 1038"
}